->'''Max''': How do you save the world ''and not tell anybody?''\\
'''Terry''': I can tell you. You can tell me. That's why I'm glad you found out, partner.
--> -- ''WesternAnimation/BatmanBeyond'', "Final Cut"

Your hero has a [[{{Masquerade}} dirty little secret]] that is central to the character and the show's main plot. He might be a superhero, or he might have [[WesternAnimation/DextersLaboratory a lab in his bedroom]], or [[Series/SabrinaTheTeenageWitch she might be a witch]]. There will sometimes be one regular Joe who knows about the hero's secret, and will also keep it secret. The Secret Keeper can be family, [[AdultsAreUseless as long as it's not a parent]].

Often, the existence of a Secret Keeper is only hinted at, rather than explicitly revealed to either the hero or the audience.

The [[TropeNamer phrase originated]] in ''Literature/HarryPotter'', where the ''Fidelius Charm'' hides a secret within a living person's soul (that person would then become the "Secret Keeper"); everyone else in the world other than the chosen person would be unable to learn the secret unless directly told of it by the Secret Keeper. Even if they originally knew the secret, the details would become muddy in their minds unless reminded by the Keeper.

See also TongueTied, for when a character is ''forced'' to keep a secret. See also TheConfidant, someone who keeps non-heroic secrets. For cases in which the hero doesn't ''know'' that someone knows his secret, see SecretSecretKeeper. Frequently discovers KeepingSecretsSucks, and is witness to TheMasqueradeWillKillYourDatingLife.
----

!!Examples:

[[foldercontrol]]

[[folder:Anime]]
* ''SonicX'' has Chris Thorndyke, his grandfather, and his two servants Mr. Tanaka and Ella right before everyone knows about Sonic and his friends.
* The whole premise of FruitsBasket is Tohru Honda serving as the Secret Keeper of the Sohma family if she wants to continue living with them, leaving even her [[ThoseTwoGuys two closest friends]] out of the loop -- even though one of them has Electric Psychic Powers.
* Melchisedec and Carmichael in ''SoukouNoStrain'' serve as Sara's Secret Keepers despite not knowing just what her secret ''is'', only that she can synchronize with a discarded Mimic.
* Hayate was the Wolkenritter's Secret Keeper throughout ''MagicalGirlLyricalNanohaAs''.
** At the same season, there's Arisa and Suzaka discovering Nanoha and Fate's secret as MagicalGirlWarrior.
* Despite being in mysterious competition with one another, the members of the SOS-dan in ''SuzumiyaHaruhi'', besides Haruhi herself, fiercely guard each other's [[SecretIdentity secret origins]].
* In ''{{Kuttsukiboshi}}'', Aya is this to her friend Kiiko's [[MindOverMatter telekinetic powers]]. Well, besides being [[YuriGenre her lover]].
* In the classic anime ''KimagureOrangeRoad'', blood members of the Kasuga family all had psychic powers and a desire to keep them a secret from the general populace. This necessitates that anyone who marries into the family (such as Kyousuke's father) must become a Secret Keeper. The manga takes this to its logical conclusion that members of the Kasuga clan must reveal their powers to those they intend to marry before they can get hitched. Hopefully, if you love them enough to marry them, they like you enough not to blab your secret to the world.
** The other major secret that Kyousuke has - his budding love for Ayukawa Madoka - is kept by his sister Manami. In the manga, she even [[spoiler: explains it to Hikaru, with the iconic "red hat" as proof.]]
** The Master of the local coffee shop, Abcb, knows the feelings that both Kyousuke and Madoka have for each other.
* Misa, Mikami and Takada all knew Light's secret at some point and helped him in his schemes in ''Manga/DeathNote''. Ryuk and Rem knew it too, but as invisible [[TheGrimReaper shinigami]], most of the time they weren't even able to tell anyone if they wanted to.
* Dr. Agasa, Yusaku and Yukiko Kudo, Phantom Thief Kid, Heiji Hattori, Ai Haibara, Vermouth, and Eisuke Hondo in ''Manga/DetectiveConan''.
** Well, actually Ai Haibara and Vermouth are ''part'' of the secret. In fact, it could be argued that they are [[spoiler: directly responsible for it]], so they may not qualify
** The trope gets invoked in a ''nasty'' manner in a {{filler}} case. [[spoiler: A girl named Shouko finds her friend Sawanami dead and, due to his {{dying clue}}s, deduces that their common acquintance Mifune is the murderer. However, Shouko is Mifune's UnrequitedTragicMaiden and decides to keep this a secret... but commits the huge mistake of actually ''telling'' Mifune that she knew the truth, but wouldn't snitch. Mifune, who had killed Sawanami because he was involved in his girlfriend's death ''and'' thought Shouko had something to do with it too, thought Shouko would snitch anyway ''and later strangled her to feath.]]
* Rin Sawamura, Shiro and Nao Makinoha, Shuichi Takamizawa, Kota Shingyoji, Hisashi Sakisaka, and Lucy Winladd in ''MidoriDays''.
* The Tendo family, Ryoga, Shampoo and her grandmother, Mousse, Ukyo, Konatsu, and Nodoka in ''Manga/RanmaOneHalf''.
** This is only in the anime - in the manga, it's easier to list those who '''don't''' know Ranma's "sercret."
* ''Manga/InuYasha'':
** Kagome's mother, brother and grandfather keep Kagome's time-travelling a secret. This leaves Souta to pick up the slack for Kagome at school (ensuring she knows when exams are and what homework she needs to do) and her [[{{Cloudcuckoolander}} grandfather]] creating hilarious and embarrassing medical conditions to both excuse her from school and prevent her friends from visiting her.
** [[UltimateBlacksmith Toutousai]]. Although it was obvious he knew the truth about [[InfinityPlusOneSword Tessaiga]] what had been hidden much better were the secrets he was keeping about [[SituationalSword Tenseiga]] and [[MoreThanInfinite Bakusaiga]].
* Misaki in ''Manga/FutabaKunChange''.
* The characters who know that Kiri is male model, Tatsuki, in ''NeverGiveUp'' are her mother, Tohya, and her best friend, Natsu.
* Tomoyo Daidouji, Syaoran Li, Meiling Li, Toya Kinomoto, and Yukito Tsukishiro in ''Manga/CardcaptorSakura''.
* Miyako Todaiji in ''KamikazeKaitouJeanne''.
* Seira Mimori and Asuka Jr. in ''KaitouSaintTail''.
* ''FreshPrettyCure'' has Kaoru, Miyuki, and later in Episode 45, the trio's parents and friends.
** ''HeartcatchPrecure'' has Tsubomi's grandmother, Kaoruko. [[spoiler:It also helps that she was a former Cure herself]].
** The ''PrettyCureAllStars'' movies reveal that each of the teams know of each other's identities. Except for the new team, which quickly becomes moot after awhile.
** In ''Anime/DokiDokiPrecure'', it would seem that Sebastian is the only human who would know the Cures' true identities. That is until in episode 41 that Alice's friend/rival, Reina, becomes one. If that wasn't enough, [[spoiler:the Cures' family and friends got to chance to find out when Cure Heart ended up revealing who she is]].
* ''Manga/HimechanNoRibon'' has Daichi becomes the secret keeper for Hime-chan about her ability to magically transform after she had to do it in front of him to save somebody.
* Karin has revealed herself as [[AiToYuukiNoPigGirlTondeBuurin Buurin]] to her classmates, Kouichi, Masami, Kashiwagi, Kaoru, Jimmy, Kyoko, and Takuma in Episode 50.
* Kazumi and Tatsuya in ''DevilmanLady''.
* Fakir becomes this for Ahiru in ''Anime/PrincessTutu'' when he discovers she's the titular MagicalGirl. She later also tells him that she's really a duck that can transform into a girl.
* Manga/{{Bleach}}:
** Both Isshin and Karin are aware of Ichigo's activities as a shinigami, but don't let on.
** Tatsuki, Keigo, Mizuiro [[spoiler: and Chizuru]] are also aware that something is happening but tell nobody outside their circle. Eventually, Ichigo admits everything to them.
** Kon became a reluctant secret keeper for Isshin. He found out hundreds of chapters before Ichigo that Isshin was a shinigami, but Urahara and Isshin both swore him to secrecy.
** Yumichika, Renji, Keigo, Komamura, Iba, [[spoiler:Akon, Mayuri and Ichigo]] are all secret-keepers for Ikkaku's bankai. [[spoiler: Mayuri's a subversion. He accidentally told Ichigo before remembering it's a secret, and doesn't care he revealed it. Ikkaku doesn't know Ichigo knows.]]
** Hisagi is the sole living person who knows the truth about Yumichika's abilities.
** The Ishida family is such an unknown to the Vandenreich that Yhwach used ExactWords to lie with the truth, ensuring the Stern Ritter learned only of Uryuu Ishida's existence. While it's implied Haschwalth knows about the family, it's confirmed that Quilge Opie definitely knew all about Souken and Uryuu Ishida, and the mysterious Ishida family secret.
* Athrun Zala in GundamSEEDDestiny is a Secret Keeper for Meer Campbell, the BodyDouble standing in for his ex-girlfriend Lacus Clyne.
* The whole [[OuranHighSchoolHostClub Host Club]] keeps Haruhi's real [[WholesomeCrossdresser gender]] a secret since she's working as a Host to pay back her debt.
* Ito and Akane in Juliet guard the secret of Makoto's real [[WholesomeCrossdresser gender]] though a few other people eventual figure it out they have much more passive rolls.
* In {{Genshiken}} it is implied that Ohno knows about Madarame's crush on Saki, as she tries to covertly give him pictures of Saki in cosplay outfits.
* Sena's title ''{{Eyeshield 21}}'' is kept by Hiruma, Kurita, Panther, Shin, the Ha-Ha Bros.
* In ''Anime/CodeGeass'', C.C. is a Secret Keeper (and sometimes BodyDouble) for Lelouch. Euphemia is a SecretSecretKeeper, since not even Lelouch realizes that she figured out on her own that Lelouch was Zero. Lelouch gains many more Secret Keepers as the second season progresses with the likes of Kallen and his own maid, Sayoko, but after the GrandFinale, only a handful of people in the world know that Zero [[spoiler: has been replaced by Suzaku Kururugi]].
* A case shows up in ''OnePiece'', regarding [[HeroicSacrifice what really happened]] between Zoro and Kuma. Aside from Zoro himself, only three members of the crew know the truth: Brook, who saw it happen (since it's next to impossible to tell if a skeleton is conscious or not); Sanji, who heard it from the Risky Brothers and told them not to tell anyone else; and Robin, who used her powers to eavesdrop on that conversation. And Zoro only knows that Brook knows; the other two [[SecretSecretKeeper keep the knowledge to themselves]] because it would devastate Luffy if he found out, and Zoro didn't do it to be praised anyway.
** Also, the Gorgon Sisters. They would sooner die than let anyone find out that they were ever slaves to the World Nobles; only four known individuals have been trusted with the secret. The first three are [[spoiler:Silvers Rayleigh]], [[spoiler:Shakky]], and their surrogate mother Elder Nyon, who helped them get back to Amazon Lily after they escaped. And the fourth is Luffy, Hancock's love interest.
* A handful of one off characters in the ''Anime/SailorMoon'' anime find out about one or more of the Sailor Senshi's identities, but they usually only show up in an episode each. The [[Manga/SailorMoon manga]] has a few more ongoing characters learn of the masquerade (most notably Motoki). It is implied in both during ''R''/the ''Black Moon'' arc that Naru does know Usagi is part of something unusual and important but that Usagi doesn't want her to ask about it.
* In ''{{Karin}}'', the character [[FaceOfAThug Kenta]] [[NiceGuy Usui]] ends up as one for the Marker/Maaka family when he learns that Karin is a [[FriendlyNeighborhoodVampire vampire]].
* In ''LightNovel/{{Baccano}}'', Ronnie Schiatto serves as [[TheOlderImmortal Maiza's]] secret keeper and only constant companion up until [[spoiler:''everyone'' in the [[TheMafia Martillo family]] winds up immortal, and Maiza catches on that that Ronnie is [[EldritchAbomination a lot less human]] than he originally presented himself as]], at which point the roles reverse.
* In ''Manga/{{Bakuman}}'', Moritaka Mashiro, after finding out that his fiancee Miho Azuki's mother Miyuki once loved his uncle, Nobuhiro, and that Miho is unaware of this, asks Miyuki not to tell her. She agrees and asks Moritaka's partner Takagi to do the same. This comes back to haunt Moritaka later, as Miho becomes angry with him for keeping it from her, and does not believe they should have secrets between them.
* In ''MaiHime'', Takumi becomes one for Akira when he first finds out that Akira is the "secret ninja" protecting the school, [[spoiler:and later when he finds out that Akira is female]].
* ''MobileSuitGundamThePlotToAssassinateGihren'' reveals that [[TheBaroness Cecilia]] [[SexySecretary Irene]] was the keeper of the keys for BigBad [[TheEvilPrince Gihren]] [[DespotismJustifiesTheMeans Zabi]]. She knew all his dirty secrets, ran black operations for him, and kept a lid on anything that might hurt his public image.
* In ''LightNovel/SakurasouNoPetNaKanojo'', Sorata is asked to keep one from Misaki regarding Jin. [[spoiler: He finds out Jin wants to go to a university in Osaka, not a local one nearby where Misaki was going. Jin says he's going to tell her at some point, and asks him not to tell her about it.]]
** Then [[spoiler:Misaki finds out about it anyway in episode 11, although it was Fuuka, Misaki's sister, casually mentioning it to Jin, who says she heard it from his mother. Although Sorata comes clean about knowing the secret, Misaki seems more excited by the fact that he turned down her sister, which mean she still has a shot with him.]]
* In ''{{Sekirei}}'', a majority of the [[BornWinner Single Numbers]] (with the exceptions of Tsukiumi and [[spoiler: Akitsu]]), as well as Uzume, Seo, and the twins Hikari and Hibiki, are sworn to secrecy about the identity of the mysterious #01. [[spoiler: It is HaremNanny Miya Asama.]] The secret is kept primarily because they are ''terrified'' of what she will do to them if they let it slip. Even the BigBad honors the secret, and leaves her alone.
[[/folder]]

[[folder:Comic Books]]
* Franchise/{{Superman}}'s secrets have a surprisingly large number of protectors:
** In the PostCrisis era, ComicBook/LoisLane discovered Clark Kent's secret identity around the time they got engaged. Afterwards, Lois was a very able Secret Keeper. In the ComicBook/{{New 52}} books, however, Lois, like her Pre-Crisis counterparts, doesn't know.
** [[Franchise/{{Batman}} Bruce Wayne]] is also one of Clark's Secret Keepers (as is Clark for Bruce). This led to an amusing sequence when Bruce assumed Lois knew ''his'' secret, because he didn't expect Clark to keep secrets from his wife, whereas Clark felt it wasn't his secret to share. By the end of the story Lois has become another of Bruce's Secret Keepers.
** ComicBook/LanaLang, in pre-Crisis what-passed-for-continuity, sometimes knew Clark's secret and sometimes didn't. In some stories she knew it but was hypnotized to only ''remember'' it in certain circumstances (such as, for example, being in the 30th century as Insect Queen... yeah, the Silver Age was like that). One 1958 story even {{Deconstructed}} why (Silver Age) Lana would make a poor SecretKeeper when she tried to cook up a new secret identity for an amnesiac Superboy as her 'cousin Andy'. Unfortunately her attempts to cover for 'Andy' backfired badly and she later ruefully concluded she just wasn't "smart enough" to hang onto the secret without blowing it. PostCrisis onward, Lana definitely knows since Clark told her and has been a special confidant to him ever since.
** Jonathan and Martha Kent started keeping Clark's secret long before he knew about it himself.
** Pete Ross discovered Superman's secret ID back when he was just Superboy during a camping trip. A convenient flash of lightning revealed Clark changing clothes, and Pete kept it secret, not even letting Superboy know that he knew. He once even used his knowledge to become an honorary member of the Legion of Super-Heroes by claiming he had telepathy and knew Superboy's secret ID. Writing the identity on a lead tablet so Superboy couldn't see. Superboy assumed Pete was bluffing and that everyone else was just going along with the joke.
* More people are in on [[Franchise/{{Batman}} Bruce Wayne's]] secret than one might expect:
** Alfred Pennyworth is his primary Secret Keeper. He knows things about Bruce that even Dick Grayson doesn't know.
** Lucius Fox is sometimes portrayed as most likely knowing that Batman and Bruce Wayne are one and the same, but not telling anyone, not even Bruce, this knowledge. In the recent movies, this was expanded to him explicitly knowing his secret and being in the loop.
** In "Hush," ComicBook/TheRiddler reveals that he deduced Batman's SecretIdentity while taking a dip in a Lazarus Pit. However, Batman convinces him to keep it secret for two reasons: first, having such a secret is no fun for an obsessive puzzler like him if every one knows it, and second, it would give the owner of the Lazarus Pits, the BigBad Ra's Al Ghul, a vital clue that the Riddler used a pit without permission and have his League of Assassins kill him no matter where he is. More recently, the Riddler has developed a mental block preventing him from remembering this.
** "Hush" actually showed a ''lot'' of Batman Secret Keepers: two Robins, Superman and Lois Lane, the Huntress, Leslie Thompkins, Zatanna, Batgirl, Catwoman, Ra's and Talia Al Ghul, the Riddler...
** Jim Gordon is generally portrayed as being a good enough detective to have found Batman's secret, but reserved enough not to tell anyone, even Bruce. In the first of the most recent Batman/Superman series, Batman, while noting the same thing about Superman's Perry White, reveals that he's aware that Gordon most likely knows.
** In one issue of ''ComicBook/BirdsOfPrey'', Barbara Gordon revealed her operations as Oracle to her father, who was initially stunned but ultimately proud of his daughter. Barbara then pulled out her old Batgirl costume, saying, "I'm so glad that you're handling this so well, Dad, because there's more to it, I'm afraid." Jim Gordon's response: "Okay, this part I knew."
* {{Batwoman}} has her dad, Colonel Kane, who is also her main source of logistical support. Also, [[TheQuestion Renee Montoya]] and {{Nightwing}} deduce her identity in ''ComicBook/FiftyTwo'' (the former knows her quite intimately, while the latter comments that she has been leaving him clues on purpose as a sign of trust).
* Mary Jane Watson was Comicbook/{{Spider-Man}}'s Secret Keeper, then Aunt May until that entire "One More Day" thing happened.
** MJ is still Spider-Man's secret keeper. They're just not romantically involved at this time.
** Then again in ''ComicBook/UltimateSpiderMan'', including former bully Kenny [=McFarlane=]. [[DumbMuscle Kenny]] actually figures it out on his own, staying up late at night, thinking about Peter's new awesomeness (ie: he flipped Kenny once, broke Flash's hand, replaced Flash on the basketball team, etc.) and Spidey's apparent availability at Midtown High School. Then he tests it. Cue the subverted BruceWayneHeldHostage.
--->'''Peter Parker''': (to himself, while he's loading books in his locker) What the-? Oh, come on... My Spider-Sense is going off at school. That can only mean one thing. And the Academy Award for best performance by an amateur super hero trying desperately to hold onto his secret identity goes to...\\
'''Kenny''': ''[kicks him into the locker]''\\
'''Peter Parker''': Ow! Owy ow! Why did you- ow! What is wrong with you!!?? Ow- Owww!!
** Miles Morales, the new ''ComicBook/UltimateSpiderMan'', shared the secret of his powers with his friend Ganke.
** Aunt May seems to play this role in the recent Film/{{Spider-Man}} movies, particularly the second movie, where she gives Peter a speech seemingly directed at Spider-Man, which helps him decide to become Spider-Man again.
*** Aunt May definitely plays this role later in Ultimate Spider-man. With that awesome matriarchy, Aunt May subverts ThereAreNoTherapists. At one point, she pulls a [[GunsAreWorthless gun on a recognized supervillain]].
* Jaime Reyes, the current BlueBeetle, was thrown a year into the future after ''Infinite Crisis''. His family, naturally enough, [[FreakOut freaked out]] on his return, so Jaime decided to prove his story about what had happened to him by revealing his secret identity. His family and friends know, but keep it a secret outside of that.
** The second Blue Beetle, Ted Kord, had his girlfriend Tracy as a Secret Keeper during his Charlton incarnation.
* It's revealed in DC Comics' ''ComicBook/IdentityCrisis'', that all the superheroes (the ones whose identities remain a secret) know each other's identities.
** Whether or not the superheroes' secret keepers are aware of the others are open to debate. Especially considering that Jean Loring knows Tim Drake is Robin, despite Tim having his identity a deep secret even from Bruce's allies.
* Wesley Dodds' girlfriend Dian Belmont knows he is [[SandmanMysteryTheatre the Sandman]], and occasionally helps him in his cases.
* GreenLantern Hal Jordan's first Secret Keeper was his airplane mechanic, Tom Kalmaku. When Tom accidentally learned Hal's identity, he respected GL enough to offer to let him erase the memory from his mind--but the offer convinced Hal that Tom was trustworthy, so he let him keep the knowledge and they became close friends.
* In a villainous example, the Kingpin kept Daredevil's secret for years, to the point that among his goons, it was well known that he knew exactly who DD was. However, a no-name criminal decides that this is unacceptable, since Daredevil still ruins criminal operations, and thus, Kingpin is indirectly responsible for the losses other gangs have suffered. Thus, the upstart turns all of Fisk's goons against him.
[[/folder]]

[[folder:Fanfiction]]
* In ''Fanfic/KyonBigDamnHero'', [[spoiler:Rika and Kyon are this to each other]], [[spoiler:Miyoko/Miyokichi]] inadvertently became one, and Kyon's sister wants to become one.
** So far, quite a few members of the extended SOS Brigade trust Kyon's sister, but Kyon himself doesn't trust her.
* In the ''Franchise/MassEffect'' SelfInsert ''FanFic/MassVexations'', Tali eventually becomes [[AuthorAvatar Art's]] secret keeper.
** He gets a lot more secret keepers in the sequel: as of the moment, Garrus, [[spoiler:Madison]], Thane, Kasumi, and Shala'Raan have all found out.
* In the FanFic/ElementalChessTrilogy, it gets revealed that Maes Hughes was this for Roy Mustang and Riza Hawkeye, before and during the early part of the ''Manga/FullmetalAlchemist'' canon. Hughes, who was Mustang's best friend, was the only one who had absolute confirmation of the actual relationship between the two (though plenty of other people guessed).
* ''FanFic/ABriefHistoryOfEquestria'': Prior to the birth of Pansy's son Plow Blade, the only pony who knew about her relationship with the Earth Pony Trencher was her friend Shield Skin, who they even used as a secret messenger. This lasted for years, until Plow Blade's birth -- since he was an Earth Pony like his father, Pansy was forced to admit the truth, leading to [[OverprotectiveDad Hurricane trying to arrest and kill Trencher]], which kicked off [[MeleeATrois the Winter War]].
* There are two examples in FanFic/AGrowingAffection:
** The five Kages and the leaders of three Kekkei Genkai clans (one of which is Hiashi, the other two are unrevealed) hold the secret origins of bloodline traits.
** Tsunade and Jiraiya, with Kakashi and Shizune as backup, keep the secret of Naruto's father's identity.
* ''FanFic/JusticeLeagueOfEquestria'':
** ''Mare of Steel'': The rest of the Mane Six, Princess Celestia, and Rainbow Dash's mother Firefly become this for Dash when she becomes [[{{Superman}} Supermare]]. [[spoiler: [[LoveInterest Thunderlane]] joins the list when he figures out her identity during her final fight with {{Brainiac}}.]]
*** In one of the side stories, she and [[Franchise/{{Batman}} Batpony]] become this for each other when he deduces her identity, and she uses her XRayVision to see that he's [[spoiler: the ''real'' Prince Blueblood (who was kidnapped and replaced by [[DiscOneFinalBoss Zod]]]].
* ''Fanfic/TheElementsOfHarmonyAndTheSaviorOfWorlds'': Celestia and King Spykoran are the only ones aware that [[spoiler: Spike is Spykoran's long-lost grandson]]. They agree to keep the secret for the time being, because [[spoiler: they can tell he's quite happy with Twilight]].
* ''Fanfic/AHairierProblemRiseOfTheFurball'': The Cutie Mark Crusaders initially become this for Apple Bloom when they witness her first transformation into a werewolf. Babs Seed later is introduced to the secret after accidentally witnessing it herself, and Silver Spoon has to keep it as well following her HeelFaceTurn. The other new lycanthrope, Lightning Dust, has keepers in Rainbow Dash, Applejack, Fluttershy, and Twilight, but thanks to a slip-up by Rainbow on Nightmare Night Rarity, Pinkie Pie, and Spike learn her secret as well.
* In ''FanFic/MegaManDefenderOfTheHumanRace'', [=ProtoMan=] is this for the fact that Nomad's alive.
** Cut Man, Guts Man, and Magnet Man are this for [=ProtoMan=] meeting with Nomad.
[[/folder]]

[[folder:Film]]
* Patrick and Grace Winslow play this role in ''Film/TheSmurfs'' regarding their little blue visitors from another time and place, because, hey...who would believe them in a world that seems to regard the Smurfs as [[RecursiveCanon a mere legend documented by a Belgian cartoonist?]]
* In ''Film/TheUnknown'', Cojo the midget knows Alonzo's secrets (that he is a murderer and that he [[ObfuscatingDisability is not really armless]]) and helps him maintain his cover in the circus.
* ''Film/ManOfSteel'': The Kents, obviously. [[spoiler: Lois becomes one, being the only person at the Daily Planet to see Superman up close. She even jokingly welcomes him to the "Planet" when she sees him at the end.]]
* In ''Film/NowYouSeeMe'', [[spoiler: at the end, after finding out Dylan was the fifth Horseman, Alma locks the secret up and throws away the key.]]
* In ''Film/AboutTime'' [[spoiler: Tim reveals his secret to his sister and actually takes her back time travelling with him. She only knows briefly however; due to other circumstances Tim ends up eradicating this moment from the timeline.]]
* In ''Film/KickAss'' Katie knows Dave is Kick Ass for most of the movie.
* Parodied in ''Film/JohnnyDangerously'', when Johnny Kelly's mother and brother are the only people who '''don't''' know he's the notorious gangster Johnny Dangerously!
* In ''Film/TheWolfman2010'', Singh [[spoiler:knows Sir John is the Wolfman and kept him restrained during nights]].
[[/folder]]

[[folder:Literature]]
* ''Franchise/HarryPotter''
** As stated above, the trope namer is the Fidelius Charm, a spell that makes one individual a literal Secret Keeper; as long as they keep the secret, it cannot be found out by anybody else. In addition, even if the Secret Keeper does tell someone the secret, that someone is unable to pass on the knowledge unless the original Secret Keeper dies, in which case they become the new Secret Keeper. This is most often used to conceal locations, and the house where Harry and his parents lived was guarded under the Charm so that [[BigBad Voldemort]] couldn't ever find them. They specifically chose [[spoiler:Peter Pettigrew]] because everyone would naturally assume [[spoiler:James Potter would select his brother-from-another-mother best friend, Sirius Black. Knowing that, the Potters decided to choose a less obvious Secret Keeper and Pettigrew became]] it. They just didn't know that Pettigrew [[spoiler: was a Death-Eater]].
** Later, Dumbledore is the Secret Keeper for the headquarters of the ''[[Literature/HarryPotterAndTheOrderOfThePhoenix Order of the Phoenix]]''.
** Harry, himself, doesn't have a Secret Keeper in this trope's sense, which is a key reason why he's so miserable every summer with the Dursleys (who know what he is, but won't let him speak of it). Hermione's parents, being supportive of her gifts and hence exceptions to the "no parents" rule, are her summertime Secret Keepers, which spares her from feeling as isolated while she's away from school.
* ''{{Zorro}}'s'' mute butler effectively hides his secret identity, and helps him out on more than one occasion.
* Safe-Keepers of Sharon Shinn's ''Safe-Keepers Series'' can be told any secret, no matter how terrible, no matter how much damage may be caused, and will never reveal it until the secret is found out by someone else, Or they get permission. Yes, they really ''will not'' tell. Never. Ever.
** This doesn't mean that they won't ''do'' anything about it, though. Fiona in ''The Safe-Keeper's Secret'' goes out of her way to help this one girl who confides in her. However, considering that [[spoiler: she doesn't actually have the Safe-Keeping gift, since she's [[ObliviousAdoption Obliviously Adopted]] and is in fact a HeroicBastard]] this may or may not count.
* Literature/{{Deryni}} Stivana [=deCorwyn=] and her husband Keryell, Earl of Lendour had twins Alyce and Vera. As a hedge against persecution, they passed Vera off as the daughter of the human Howards. Alyce and Vera only learned of this after their parents were dead. They kept the secret between themselves and their tutor of ''ars magica'' Father Pascal until they Named their sons, when Alyce told her husband so he could assist in the ritual, and when King Donal paid a surpise visit to participate in Alaric Morgan's Naming. Alyce blocked Kenneth Morgan's memory at his request, Donal promised Vera that the secret was safe with him, and [[spoiler: both Donal and Alyce died in a few months' time]]. Morgan and Duncan kept the secret between them for many years.
* In the final books of ''Literature/{{Animorphs}}'', the Animorphs end up revealing their powers and ongoing battle to their families as part of hiding them away from the Yeerks.
** The Animorphs are also mutual Secret Keepers: their allies include a race of ancient androids who have been posing as normal humans at least since the time of the Great Pyramids, and a colony of alien freedom fighters who escaped from the Yeerks. They also know the identities of two key members of the Yeerk Peace Movement. Later, Visser One figures out that they're human (because [[spoiler:"Andalites don't make human pop culture references!"]]), while they find out that she has [[spoiler:two human children]]--again, they become mutual Secret Keepers for strategic reasons.
* In Literature/ASongOfIceAndFire, only two people survived the battle at the Tower of Joy before the start of the book: Ned Stark and Howland Reed. There are many clues for the reader as to what Ned's big secret is, but it's clear that Howland Reed is probably the only person in-universe who knows. Knowing the author's AnyoneCanDie ShootTheShaggyDog tendencies, Howland Reed will probably still wind up dying before anybody else finds out.
* In ''Literature/TheWheelOfTime'', three people know Perrin can talk to wolves: Egwene, Faile, and Elyas.(Who can also talk to wolves, and helped Perrin discover that he had the ability in the first place.) Also [[spoiler: Moiraine knew about it too, but she was out of the picture, and believed dead for 8 books and has only just returned.]].
* In Literature/TheStormlightArchive, Teft and Lopen end up acting as Kaladin's Secret Keepers after Kaladin first discovers his magical abilities (though Teft actually knew about them before Kaladin even did) later the rest of Bridge 4 gets let in on it, though it was kind of necessary seeing as Kaladin demonstrated said abilities fairly spectacularly. Also Shallan and Jasnah are currently mutual Secret Keepers of their shared innate soulcasting powers, and Dalinar's sons and Navani are keeping the secret of Dalinar's visions.
* In the ''Literature/WarriorCats'' series, there's quite a few.
** Several cats help keep forbidden relationships hidden. Fireheart and Mistyfoot do this for Graystripe and Silverstream's relationship, and [[spoiler:Squirrelflight raises Leafpool's kits as her own]].
** In the second series, Leafpaw is the only cat that knows about both prophecies: the one that the traveling cats recieved, and the fire-and-tiger sign.
** [[spoiler:Jayfeather, Lionblaze, and Leafpool know that Hollyleaf killed Ashfur]], but they decide not to reveal it to the Clan. Apparently keeping secrets just runs in the family.
* One ongoing example and two plot-specific ones in the ''AuntDimity'' series:
** Bill, Emma and Derek know about Dimity's ongoing contact with Lori via the journal (Bill and Emma have actually experienced it for themselves). To date, they have not shared this info with anyone else, not even Dimity's former attorney Willis Sr.
** Gerald Willis in ''Aunt Dimity's Good Deed'' guards [[spoiler: the remains of Sybilla Markham Willis and the journal of her brother-in-law's conversations with the dead Sybilla (after he killed her for marrying his younger brother)]]. They were passed from father to eldest son for some three hundred years.
** A major plot resolution in ''Aunt Dimity Digs In''. Many years earlier, Italian [=POW=] Piero Sciaparelli worked for old Mr. Hodge on his farm and found [[spoiler: an ancient Roman grave in the floor of the stables]]. When his daughter Francesca became engaged to young Burt Hodge, her father entrusted her with the location of it so she could protect it from vandals and archaeologists, and he gave her a replica of the bronze ''phalera'' to wear as a pendant. Later on, [[spoiler: her younger sister Annunzia or "Annie"]] married Burt and took over the primary role of protector [[spoiler: even getting her own ''phalera'']]. Anxieties over which of the two might reveal the secret (the elder sister dating the archaeologist or the younger trying to save a drought-stricken farm from total ruin) drive the family animosity.
* In the ''Literature/RainbowMagic'' series, Rachel and Kirsty are this for the fairies, as is oneshot character Rebecca.
* Discussed in ''Literature/HowToBeASuperhero'' as an inevitable effect of super-heroics, due to the hero's slip-ups:
-->1. You park your Crimemobile in the garage.\\
2. You put your dirty costume in the laundry basket.\\
3. You keep shouting, "Eat disintegrator blast, Crimemaster!" in your sleep.
* ''Literature/TheUnderlandChronicles'':
** Lizzie is often required to explain why her family members have disappeared for extended periods of time.
** [[spoiler:Mrs. Cormaci]] becomes this for the family starting in ''Gregor and the Marks of Secret''.
* In ''Literature/PleaseDontTellMyParentsImASupervillain'', Claire's mom, a former villain herself, keeps the kids identities safe.

[[/folder]]

[[folder:Live Action TV]]
* Tony Nelson on ''Series/IDreamOfJeannie''. Roger Healey also became one of these after the first few episodes.
* Janet from ''Series/MyHero''.
** Tyler technically could count as well, except no one would believe him anyway...
* Original Cindy, from ''Series/DarkAngel''
* Chris and Ginge, ''Series/TheTomorrowPeople''.
* Harvey Kinkel in the later seasons of ''Series/SabrinaTheTeenageWitch''.
* Naru Osaka and Motoki Furuhata in ''Series/PrettyGuardianSailorMoon''.
* ''Series/TheSecretWorldOfAlexMack'': Alex's friend Ray, and her sister Annie.
* ''Series/OneHundredDeedsForEddieMcdowd'': Justin Taylor
** The last episode has Tori.
* Keely in ''PhilOfTheFuture''.
* Harper in ''WizardsOfWaverlyPlace''.
** Justin's best friend, Zeke, becomes this in season 4.
* The family (yep, her parents too) of Raven from ''Series/ThatsSoRaven'', is fully aware of her secret PsychicPowers, most likely even before she was. These were later revealed to be a hereditary trait. The ability is treated serenely since the very first episode of the series, despite the sitcom-y mishaps that regularly occur because of them.
** It's also played straight with Eddie and Chelsea.
* On ''Series/{{Torchwood}}'', Rhys Williams ([[ActionGirl Gwen Cooper's]] fiance), stumbled onto proof of just what it is that Gwen does for Torchwood. Captain Jack Harkness decides to not dose Rhys with {{Retcon}} (Torchwood's amnesia pill) after he sees how much good it does Gwen to have someone outside of Torchwood to talk to about work.
* In ''Series/{{Dexter}}'', Harry, Dexter's foster father, is the typical example. The second is the Ice Truck Killer, Dexter's nemesis, [[spoiler: who is appropriately revealed to be Dexter's biological brother.]]
** He gets another one in season 7 when [[spoiler: his adopted sister Debra walks in on him killing season 6's BigBad and he's forced to confess]].
* Zach was Claire's Secret Keeper on ''Series/{{Heroes}}''.
** Ando is Hiro's Secret Keeper.
** Claire herself was the Haitian's Secret Keeper for a while ... not about their powers, which Noah already knew about, but about his not being mute.
* Merton Dingle and Lori Baxter in ''BigWolfOnCampus''.
* ''Series/NewAmsterdam'': Omar (and at least one other kid of John's) in regards to their father's immortality.
* On ''Series/{{Bewitched}}'', Darrin Stephens acts as a Secret Keeper for not only his wife, Samantha, but also for his mother-in-law, Endora, her father, Maurice, as well as Samantha's many aunts, her Uncle Arthur, and Samantha's witch-doctor, Doctor Bombay, all of whom interact with various mortals during the course of the series.
* The writers of ''Series/{{Smallville}}'' have had to let so many people in Clark's secret to keep the show fresh that Lois Lane is about the only one who DOESN'T know by now. Clark told Pete his secret in season two when the latter discovered his spaceship, Alicia revealed Clark's powers to Chloe in season four and [[CrowningMomentOfHeartwarming Chloe tells him she knows in the season five premier]], Lionel found out in season five, Lana started causing trouble around season six and found out in the finale, Lex found out in the season seven finale but was then PutOnABus.
** [[spoiler:Lois seems to know now and is currently a SecretSecretKeeper as Chloe was before her.]]
*** [[spoiler: As of the episode "Isis", it's official; Clark confessed that he's the Blur to Lois, who responded by jumping into his arms, kissing him and asking, "What took you so long?"]]
*** Though it did take even longer for her to find out about the Justice League, which led to some particularly funny moments, like when [[spoiler: Tess, despite knowing that Lois knows Clark's secret]], still plays dumb because [[spoiler: Lois doesn't know that ''Tess'' knows (and more than she does to boot)]]. The first part of season ten gets a bit confusing at times.
** Tess was a Secret Keeper as well, which was particularly important since she was [[BigBadEnsemble one]] [[WellIntentionedExtremist of]] [[MisanthropeSupreme the]] [[BigBad bad]] [[AntiVillain guys]], yet she still kept his secret from everyone. [[spoiler:She had a HeelFaceTurn, though.]]
* ''PushingDaisies'': Emerson and Chuck are keeping Ned's secret that he can [[{{Necromancer}} bring the dead back to life]], while Ned, Emerson ''and'' Olive are keeping Chuck's secret that she's not dead, but Olive thinks that Chuck faked her death whereas Ned and Emerson know that she did die and was brought back.
** Also, Olive eventually becomes Lily's secret keeper, hiding the fact that [[spoiler: Chuck is actually Lily's ''daughter'', not her niece, conceived during an affair with her sister's fiance.]] Olive gets so overwhelmed by all the secrets that at one point she runs away to nunnery.
* Gaius from ''Series/{{Merlin}}'' is the only person (as yet) in town who knows about Merlin's powers, as well as being his [[{{Mentors}} mentor]].
** Lancelot knows too, but has agreed to keep it a secret.
** Likewise, Merlin is Lancelot's Secret Keeper: he's the only one who knows that Lancelot is still in love with Guinevere.
** On the same show, Gaius, Merlin and Gwen are the only ones that know Morgana has precognitive dreams.
*** {{Inverted}} in regards to Morgana in season 3. For the first half of the season only Merlin and Gaius know the secret that [[spoiler: Morgana is evil]], but they are unable to tell anyone about it without any proof, despite dearly wanting to warn their friends. The same thing happens with Agravaine in season 4. They both reveal themselves as traitors.
** In season 5, [[spoiler: Mordred]] and Merlin are this for each other, as they're both warlocks.
* The wives of ''TheUnit''.
* In ''Series/{{Psych}}'', the only people who know that [[SherlockScan Shawn Spencer]] is a PhonyPsychic are his father, Henry, and his best friend, Gus.
** That's debatable. Lassiter claims to not believe and wants to expose him as a fraud, even hooking him up to a polygraph machine (which Shawn beat due to his father's extensive training). It would seem DaChief doesn't believe it either, but Shawn is really good at solving crimes, so she doesn't care how he does it.
** As of Season 5, there is also amateur profiler Declan Rand and, oddly enough, Curt Smith from Tears for Fears.
** And as of Season 7, Juliet finds out, at first reacting in anger but eventually resolving to keep the secret once Shawn proves that he cares more about her than anything else, including his work at the SBPD. She also realizes that the cases he solved might be jeopardized if he told the truth about it.
* ''Series/MightyMorphinPowerRangers'': the first people to discover the Rangers' secret identities were Rocky, Adam, and Aisha, and they pledged to keep them secret. They weren't able to play this role for very long however, as Jason, Zack, and Trini were soon "[[PutOnABus sent to a peace conference]]", and Rocky, Adam, and Aisha became their replacements as Rangers.
** Although it never happened on the show, it was originally supposed to be revealed that Ernie from the juice bar had known the secret identities of the Power Rangers all along. This is why he would always give them drinks on the house as a sign of appreciation.
* ''Series/PowerRangersZeo'': Tommy, while morphed, tries telling his brother David that his unmorphed identity is safe, but doesn't believe him until Tommy demorphs in front of him. Presumably he keeps the identity a secret, though it is possible that David's father is also aware of Tommy's identity as a ranger.
* ''Series/PowerRangersWildForce'' has two episodes in a row where one ranger has their identity revealed.
** In "Three's a Crowd", Kendall, a girl Black Ranger Danny is madly in love with, as well as a rich young man trying to win her love, both discover Danny's identity. Neither of them show any desire to reveal his secret, but the would-be lover does tell Danny that he shouldn't date Kendall due to his responsibilities, and while it's somewhat implied that he's just being a JerkAss so that he can have Kendall to himself, Kendall ultimately says the same thing at the episode's end.
** The following episode, "A Father's Footsteps", has White Ranger Alyssa's father, a martial arts master whose specialty was a family tradition, come to visit. Alyssa runs very late for their meeting, and he leaves, only to see the Power Rangers fighting the MonsterOfTheWeek, and recognizing Alyssa by her martial arts moves. They share a heartfelt moment in the end, but Mr. Enrilé only praises her by calling her his "white tiger"; as the family's martial art was referred to as "Tiger Style", it's unknown [[SecretSecretKeeper whether or not Alyssa finds out he knows.]]
* ''Series/PowerRangersNinjaStorm'' has Red Ranger Shane's older brother, a very successful businessman who is somewhat distant from Shane, discover his secret. He had previously complained about Shane not having responsibility, but revises his whole attitude upon learning the secret. Unfortunately, he's a one-shot character.
* ''Series/PowerRangersMysticForce'' has Toby, the rangers' boss at their civilian jobs, but he doesn't find out until the fourth-to-last episode…though they did use a SarcasticConfession on him at an earlier point to explain why they continuously ran off during their shifts. Subverted, however, in that he pretty much tells the whole town in order to gather enough energy to give the Rangers the final boost in power that they need to destroy the BigBad.
* Fran in ''Series/PowerRangersJungleFury'', who discovers the secret identities of her fellow pizza-parlor staff around the time they get their MidSeasonUpgrade.
* ''Series/BuffyTheVampireSlayer'':
** The Scoobies are Buffy's Secret Keepers, but they all stretch the definition of "normal". Many of the Scoobies start outside the fold as "normals" and eventually get pulled in to Scoobiedom (Cordelia, Oz, Tara). Another example would be Buffy's mother Joyce after Season 2.
** Principle Snyder knew about the existence of the Hellmouth all along - and was even charged to keep it a secret from as many people as possible by the Mayor himself. That said, he was completely oblivious to Buffy's identity or the Scooby Gang.
* In ''Series/{{Wolfblood}}'', Maddy and Rhydian act as secret keepers for each other. At the end of season 1 [[spoiler: Tom and Shannon find out, but agree to keep it a secret]]
* HannahMontana's secret keepers (aside from Bobby Ray and Jackson) are Lilly and Oliver. Later, there's Jake Ryan, Lilly's mother, Oliver's mother, Officer Daria and his daughter. That is until everyone in her hometown (plus one British journalist and his daughters) discovers the fact in the movie... and by the end of the series, everyone in the ''world'' knows it.
* Almost all the major {{Muggle}} characters on ''KyleXY'' end up being this, although in this case it's also to help Kyle and Jessi. At one point, it causes a CrowningMomentOfFunny for Josh as he spills all his ''other'' secrets. Josh also briefly doubles as one for Andy, before her cancer is made public.
* Marta from ''Series/QueenOfSwords''.
* Devon (Captain Awesome) on ''Series/{{Chuck}}''. [[spoiler: He's now been joined by Morgan.]]
** [[spoiler: And now they have both been joined by Casey's daughter Alex, as well as Ellie.]]
* On ''Series/BosomBuddies'', Amy kept the secret that Kip and Henry were [[DisguisedInDrag pretending to be their own sisters]] during the first season. In the second season, the remainder of the main were also in on the secret and helped maintain the ruse.
* In ''Series/{{Fringe}}'', [[FunPersonified Agent Lincoln Lee]] from the AlternateUniverse Fringe Division prides himself as this when he is speaking to (Alternate)Olivia. Later, he decides that he "can't keep secrets for shit" and spills it all to (Alternate)Charlie Francis.
* In ''[[Series/TheQuestForKarla Tinker Tailor Soldier Spy]]'', only George Smiley ever knew Control's real name.
* ''Literature/{{Aquila}}'': Mrs. Murray discovers the ship and keeps the secret in the second season.
* ''Series/{{Warehouse 13}}'': It's far from unheard of for an outsider to discover the Warehouse in some way, but it hasn't been made into a major plot point yet; as of yet, most of the outsiders that have learned enough to be a threat have either been recruited or killed; the only known exceptions as of yet are Claudia's brother, Mrs. Frederic's grandson, and Monty the Magnificent, an elderly magician that was let in on the secret due to his passion for "real magic." However, the series also has a ChekhovsGun that has yet to be fired: each Warehouse agent is allowed to reveal the true nature of their work to exactly one living person. But as was said earlier, it hasn't been made into a major plot point yet.
* In ''TheListener'', Mercer, Oz, Marks and later Olivia is this for the mind-reading Toby. In season two, Detective [=McCluskey=] and Dev Clark join the team.
* Jonathan is this for the ghostly Ainsworth sisters in ''Series/DeadGorgeous''.
* In the TV series adaptation of ''Franchise/TheGreenHornet'', Lenore "Casey" Case and District Attorney Frank Scanlon keep the Hornet's and Kato's secret identities (Scanlon parallels the use of Police Commissioner Higgins as a secret keeper and law enforcement contact in the original radio series).
** Late in the radio show's run, Lenore Case learned about Reid's second career as the Hornet and helped cover for him.
* In ''Series/FreeSpirit'', Gene and his older siblings, Robb and Jessie, become forbidden from telling anyone about their nanny, Winnie Goodwin, performing witchcraft.
* ''Series/{{Charmed}}'': There's a fairly extensive [[http://charmed.wikia.com/wiki/Secret_Keepers list]] of mortals who know that magic is real, and specifically that the Halliwell sisters are actually witches. The most notable examples are Victor Bennett (father to three of the four sisters), Inspector Andy Trudeau (oldest sister Prue's LoveInterest)[[note]]Though he only acts this part for about half of season one, at the end of which he dies[[/note]], Inspector Darryl Morris (Andy's partner), Homeland Security Agent Kyle Brody (another LoveInterest, who eventually dropped from this trope when he died and became a Whitelighter), Homeland Security Agent Murphy (who figured out that something was up when the sisters faked their deaths and subsequently helped them "come back from the dead"), and Henry Mitchell (youngest sister Paige's boyfriend, who she eventually married). In the [[ComicBookAdaptation season nine comics]], Phoebe's boss Elise Rothman also becomes a SecretKeeper when the sisters save her life (Paige had to [[HealingHands heal]] her, and then they had to magically make her look like she was still injured in order to properly prosecute the man who had attacked her).
* Mrs. Roper on ''Series/ThreesCompany'' finds out early on that Jack isn't actually gay, but keeps the knowledge from her husband so Jack can continue sharing an apartment with two women.
[[/folder]]

[[folder:Roleplay]]
* Roleplay/DinoAttackRPG has the siblings Bart and Carrie Enderson, both [[TheBartender bartenders]] who both kept secrets for a different mercenary. To add a cruel twist of irony, neither knew about the other's activities (at least not until ''after'' the war and both mercenaries were dead), and one of their clients was determined to kill the other.
[[/folder]]

[[folder:Video Games]]
* In the second game of the ''EagleEyeMysteries'' PC EdutainmentGame series, protagonists Jake and Jennifer Eagle, as well as your [[TheFaceless unseen player character]], become Secret Keepers in "Case of Blood's Bold Bauble." A distant relative tells you that there's a particular story that has been kept within his immediate family for generations: that three centuries ago, an ancestor found a small but very valuable ruby that was dropped by the titular thief Captain Blood and his gang, who beat a hasty retreat after attempting to break into the Tower of London to steal the Crown Jewels. The ancestor, fearing he would be implicated in the robbery if he tried to return the ruby, kept it for himself and only told its story to his son, who in turn told the tale to ''his'' son, and so on. By the time you, Jake and Jennifer have been told the story, the secret's origins are so distant that the ruby's revelation can no longer hurt the family; the only reason the relative tells you the story is because he thinks one of his three children, who are currently the only other people who know the family secret, might have broken the bond of parent-child trust and told the secret to cash in on it--hence, the beginning of your covert investigation to find out who's responsible without tipping off any of the children as to your knowledge. [[spoiler:Turns out none of the kids talked--the oldest son is set to star in a film about a very different Captain Blood, and the misunderstanding arose from that]].
[[/folder]]

[[folder:Web Original]]
* In ''[[Machinima/RedVsBlue Red vs. Blue: Reconstruction]]'', Agent Washington hides the fact that he has all the memories of the Epsilon AI, which is the manifestation of the Alpha AI's memories, which ''itself'' was created from the Director's mind. This means that he has knowledge of both the torture used to split the Alpha into separate [=AIs=] and all of the access codes used in the Director's lab.
* Lester from ''Literature/AngelOfDeath'' is the only human outside of the MenInBlack who knows Cody is a lich.
* In the WhateleyUniverse, hardly anyone outside of SuperheroSchool Whateley Academy knows Phase is a mutant: just her big sister Gracie and Gracie's spouse, and their two renters.
* In ''Series/{{Noob}}'', Gologotha is the only one who knows how Gaea got her avatar back after getting banned permanently from the game for borderline illegal activity [[spoiler:until an unexpected third party makes the bargainning chip's existence public]].
[[/folder]]

[[folder:Webcomics]]
* Parodied [[http://www.qwantz.com/index.pl?comic=749 here]] in ''Webcomic/DinosaurComics''; the AltText explicitly identifies T-Rex as "the worst Lois Lane ever".
* In ''Webcomic/ElGoonishShive'', Outside the "core" cast, Melissa is Noah's secret keeper.
** Justin is not only the Secret Keeper for the core group, keeping their activities secret from everyone (especially George), he's also keeping [[spoiler:Noah's SecretIdentity as the Child Left Behind]] a secret even from his closest friends.
* In ''TheDreamer'', Yvette is the only person who knows about Beatrice's time-travel dreams.
* In ''Webcomic/ElectricWonderland'', Aerynn Arlia's friends and co-workers must make sure that the authorities of {{Cyberspace}} never find out about her performing illegal witchcraft.
[[/folder]]

[[folder:Western Animation]]
* Elena Potato and her cousin Lonzo in ''MonsterAllergy''.
* Matt Olsen in ''WesternAnimation/{{WITCH}}''.
* Chloe Flan, Sabrina's BlackBestFriend, who was invented wholecloth for the AnimatedAdaptation ''WesternAnimation/SabrinaTheAnimatedSeries''.
* Dee Dee, from ''WesternAnimation/DextersLaboratory'', is the only one who knows of Dexter's Lab besides Dexter himself.
** The only character in the main cast, anyway; there's also Dee Dee's two best friends, Mee Mee and Lee Lee, and Mandark, Dexter's rival, who has a lab of his own.
* Richie from ''StaticShock'', who later becomes a superhero himself.
** Frieda [[ComicBook/{{Static}} in the comics.]]
* Sam, Tucker, and later Danny's sister Jazz in ''WesternAnimation/DannyPhantom''.
* Scrooge [=McDuck=] and Mrs. Crackshell are the only ones in ''WesternAnimation/DuckTales'' who knows that Fenton is Gizmoduck.
* Debbie Thornberry, in the last five episodes of ''TheWildThornberrys''.
* Max, from ''WesternAnimation/BatmanBeyond'', as of the episode "Hidden Agenda".
** And as of the ''[[WesternAnimation/JusticeLeague Justice League Unlimited]]'' episode, Dana knows as well. Terry considered trying to [[ItsNotYouItsMyEnemies break up with her for her own safety]], but was last seen asking her out while palming an engagement ring.
* One episode of the ''WesternAnimation/JusticeLeague'' shows ''part of the U.S. Government'' to be this for Batman. Amanda Waller even uses this to [[CrowningMomentOfAwesome intimidate the Dark Knight]] in ''Ultimatum'':
--> '''Batman:''' Who are you people?!
--> '''Amanda Waller:''' That's a national security matter. And if I were you I wouldn't probe the situation too closely... ''rich boy''.
* Ah-Mah and Ray Ray Lee ''[[TheLifeAndTimesOfJuniperLee Juniper Lee's]]'' grandma and little brother respectively, and later her older brother, Dennis Lee. (Although they're not quite regular Joes -- both can see magical creatures, and Ah-Mah was June's predecessor. One episode reveals Ray Ray's ability as being an accident. For Dennis, he can only see magical creatures when he wears a talisman.)
* In ''WesternAnimation/HeyArnold!'', Phoebe, Patty, Trish Wittenberg, Grandpa Phil and Brainy all know Helga Pataki's most dark and deep secret: her overwhelming love for Arnold.
** As well as Helga's shrink Dr. Bliss, who is a Secret Keeper by way of professional confidentiality.
** Helga admits it to Lila as well, threatening her with violence so she wouldn't tell.
* Subverted by Gaz on ''WesternAnimation/InvaderZim''. She discovers early on that Zim is an alien, but doesn't care. When Dib says "Zim's trying to conquer the world," Gaz replies, "but he's so ''bad'' at it." [[IneffectualSympatheticVillain Which is true]], but...
* Trixie and Spud, from ''WesternAnimation/AmericanDragonJakeLong''. In the episode where they find out about Jake's dragon powers, Jake's grandfather gives him a potion that will erase their memories and [[ResetButton put everything back the way it was]] to maintain the {{Masquerade}} around the magical world. In a subversion of StatusQuoIsGod (and possibly as a "screw you" to ''JuniperLee'', which had a reset after her friends found out), he pours it out in a potted plant rather than dose their drinks, and they continue to help him in both forms.
* The Holograms (Kimber Benton, Shana Elmsford, Aja Leith, and Carmen 'Raya' Alsono) from ''JemAndTheHolograms'' count here as well.
* In ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983'', only a few others know Adam is He-Man: Cringer, Orko, Man-at-Arms, and the Sorceress. In the spin-off ''WesternAnimation/SheRaPrincessOfPower'', his twin sister Adora had Kowl, Madame Razz, Light Hope, Spirit and later, Loo-Kee who share her SecretIdentity as She-Ra. They're {{Secret Keeper}}s of each other. By extension, it is safe to assume those who know He-Man's secret also know She-Ra's, and Vice-Versa.
** He-Man also, at the Sorceress' request, keeps the secret that the Sorceress is Teela's mother.
* Both averted and played straight in ''WesternAnimation/KimPossible''. Averted in that [[ActionGirl Kim's]] hero status is publicly known. Played straight with Ron Stoppable when he attended a [[AcademyOfAdventure ninja school]]; he promised Yori and Master Sensei that he wouldn't tell anyone about the school, even Kim. Later in the series, Yori allowed Ron to tell Kim (who had already discovered the truth about the school on her own). Presumably Kim then became a Secret Keeper for the school as well.
* ''WesternAnimation/DarkwingDuck'' has sidekick Launchpad ([[IdiotHero who calls him 'DW' even when Darkwing's in civilian garb]]) and daughter Gosalyn (who occasionally calls him 'Dad' when he's in costume). Somehow neighbour child Honker seems to be in the know as well. No information's shown on if Morgana [=MacAwber=] knows her Darkwing has a life as Drake.
** She does. There's an episode where she meets Honker's family, after complaining that Darkwing never introduces her to any of her friends. She even calls him Drake in front of them.
* The human friends of ''WesternAnimation/TheSmurfs'' act in this role to prevent humans from ever getting their hands on them.
* In a twist on the usual SecretIdentity trope, Robin from ''WesternAnimation/YoungJustice'' is hiding his civilian identity from his superhero teammates. WordOfGod (and [[AllThereInTheManual Free Comic Book Day tie-in]]) is that while Batman has forbidden him from revealing his real name, he told Wally anyway.
* Cavin and later, Princess Calla from WesternAnimation/AdventuresOfTheGummiBears.
* {{Deconstructed}} in ScoobyDooMysteryInc where [[spoiler: Velma keeping Angel[=/=]Cassidy's Identity a secret unknowingly sets a chain of events that causes the downer ending of the first season of the show.]]
* ''WesternAnimation/{{Motorcity}}'': Claire keeps secret that Julie's dad is the BigBad.
* In ''WesternAnimation/{{Gargoyles}}'', Eliza Maza and, later, Matt Bluestone work to conceal the existence of Goliath and his clan from humanity, as does David Xanatos when he's not trying to kill them. [[spoiler:By the end of the second season, they fail ''spectacularly''.]]
* ''{{Freakazoid}}'' had Roddy and Cosgrove, and later Steff and Professor Jones as of "Mission: Freakazoid" when Cosgrove let it slip.
* ''Westernanimation/PhineasAndFerb'' has [[spoiler:Stacy Hirano becoming this for Perry in "Happy Birthday Isabella" to avoid having her memories erased, and having to sit through a terrible movie she watched.]]
[[/folder]]

[[folder:Real Life]]
* Lawyers (at least in the United States, the United Kingdom, and some other common law jurisdictions). While there are a few exceptions to attorney-client privilege (generally having to do with preventing reasonably certain serious bodily harm), for the most part, an attorney can't reveal anything that their client tells them in confidence. This means that in most, if not all, U.S. jurisdictions that if an attorney find out their client committed a crime that an innocent person's in jail for, their ethical obligations to their client prevent them from saying anything without their client's permission, even if the other person is serving a life sentence. KeepingSecretsSucks.
** In response to this dilemma some state bars have added rules that allow for limited disclosures in this situation, arguing that justice demands the innocent go free.
** Similarly, although doctors are required to report evidence of a crime (gunshot wounds, suspected child abuse, etc.), most details of your medical history are protected by doctor-patient privilege.
* Catholic priests are bound by The Seal of the Confessional to never divulge what anyone says in confession, even if they confess to a crime. A priest violating the seal would risk laicization (defrocking) and excommunication (which means that he could not receive any sacrament until he would (ironically) confess his violation of the seal).
** There have been cases in the Papal States wherein the authorities broke the seal of the confessional, at papal direction, to arrest and prosecute murderers.
*** In the United States, the Supreme Court has ruled that gathering information by violating the Seal is a violation of the Fifth Amendment and as such unadmissible in any court.
* Creator/StephenFry has [[http://www.stephenfry.com/forum/topic/stephen-knows-the-meaning-of-the-ultimate-answer claimed]] that DouglasAdams once told him in confidence "[[Series/TheHitchhikersGuideToTheGalaxy exactly why 42.]]" Apparently, "The answer is fascinating, extraordinary and, when you think hard about it, [[ItMakesSenseInContext completely obvious.]]" However, he has vowed to take the secret with him to the grave.
* Other than Carly Simon herself, {{NBC}} Sports' Dick Ebersol and Creator/TaylorSwift are the only people in the world who know for sure who "You're So Vain" is about - Ebersol won a charity auction to learn the identity in 2003, and ten years later [[https://www.youtube.com/watch?v=y7CsaOF3S5c Simon told Swift when they performed the song in concert]].
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