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''Did EspionageTropes send you? Shhh... Don't tell anyone you found this place. This index is a secret. It's here that we index all the darkest secrets stored on TVTropes. If you're looking for secret personalities look over at MoreThanMeetsTheEye. If it's there, don't look for it here. For more mysteries see MysteryTropes, don't bother with the InfauxmationDesk. And remember, be careful TheIndexIsWatchingYou.''
All individuals handling this information are required to protect it from unauthorized disclosure in the interest of the international security of TV Tropes.

* AncientConspiracy: A secret group is behind everything.
* ApocalypticGagOrder: The government keeps an existential threat to a specific location or the whole civilisation a secret.
* BatmanInMyBasement: When someone highly conspicuous hides in a "normal" location.
* BigSecret: Hiding a secret causes a person to be suspected of a crime.
* BlackSite: A secret base.
* BookcasePassage: A bookcase hides a secret passage.
* CannotKeepASecret: Someone who cannot keep a secret to save their lives.
* TheConfidant: The direct opposite of CannotKeepASecret. Someone who keeps a friend's secrets.
* CovertGroup: A secret organization.
* DarkSecret: A horrible secret that a character is terrified to reveal.
* DidNotDieThatWay: When someone finds out that they were lied to about a loved one's death.
* DominoRevelation: One revealed secret reveals another secret, which reveals another, which...
* EasterEgg: The programmers hid a secret in the game.
* EmpireWithADarkSecret: A whole civilization is built on a horrible secret.
* EverybodyKnewAlready: Everyone actually knows your deep dark secret, but they're too polite to tell you.
* EvilRunningGood: Evil controls good
* EyeObscuringHat: The NiceHat that still conceals who you are and adds an air of mystery.
* GasLeakCoverup: Whatever it was, it ''wasn't'' a gas leak.
* GoodRunningEvil: Good controls evil
* GovernmentConspiracy: The government is hiding a secret from ''everybody''.
* TheHiddenHour: A secret time that only a few people know exists.
* HiddenTrack: A secret song on a CD or record.
* HideYourOtherness: Keeping up the lies that protect the secret world.
* HidingTheHandicap: Hiding the fact that you're disabled or afflicted.
* IllNeverTellYouWhatImTellingYou: Blurting out a secret while simultaneously claiming you won't do just that.
* IfOnlyYouKnew: A character says something that connects to a fact or event [[LockedOutOfTheLoop of which he's unaware of]], usually to someone who is in the know.
* InformationWantsToBeFree: A secret must be made public. The bad guys want to prevent that.
* InfractionDistraction: By feigning a minor offense, the big one can be kept secret.
* InternalReveal: Trusting the secret to an associate.
* InvisibleWriting: Writing is made invisible to keep it a secret.
* IsThatWhatHeToldYou: A character reveals to a person what someone else has been keeping from them.
* KeepingSecretsSucks: Sometimes you need to lie or kill to keep a secret.
* KilledToUpholdTheMasquerade: Find out the big secret, and die for your efforts.
* LockedOutOfTheLoop: Everyone is conspiring to keep the main character oblivious.
* LooseLips: Someone gives away sensitive information unintentionally.
* LoveConfessor: Confiding your love for someone to a third party.
* LovesSecrecy: Delighting in keeping secrets from others and mocking them about it.
* TheManBehindTheMan: The BigBad is secretly controlled by an even Bigger Bad.
* {{Masquerade}}: People hide a secret world in the real one.
* TheMasqueradeWillKillYourDatingLife: Upholding the masquerade or keeping a SecretIdentity makes dating difficult.
* MultilayerFacade: Keeping secrets under secrets.
* MutualMasquerade: Two people part of the same (or different) conspiracies both think the other is normal.
* MySecretPregnancy: A woman hides her pregnancy.
* MysteriousPast: A character has a secret past.
* OpenSecret: Something is declared secret, but everyone actually knows anyway.
* OstentatiousSecret: Someone openly advertises that they have A Secret.
* PlayingNiceForNow: Don't let anyone know we are at each other's throats.
* PlotDrivingSecret: If he knew the truth, we wouldn't have a plot.
* PubliclyDiscussingTheSecret: Characters who know a secret disregard all semblance of actual secrecy.
* SecretArt: A technique or magical ability known only to a few.
* SecretCharacter: A playable character that is a secret until they're unlocked.
* SecretChaser: A character insistent on finding out another character's secret.
* SecretDiary: A diary that is kept in secret.
* SecretHandshake: The secret means of identifying people who are keeping a secret together.
* SecretIdentity: An identity that is used to hide a secret double life.
** SecondSuperIdentity: When there is more than one secret identity.
* SecretKeeper: The person you trust with your secrets.
* SecretSecretKeeper: The person who is keeping your secrets that you don't even know about.
* SecretLevel: A level of a game that is hidden and not needed to beat the game.
* SecretOtherFamily: A character has more than one family and hides them from one another.
* SecretPath: A hidden path that bypasses obstacles by taking a route not many know.
* SecretPolice: A police force that hides the fact that they exist.
* SecretRelationship: Two characters keep their relationships a secret from everyone else.
* SecretStabWound: A character hides an injury.
* SecretTestOfCharacter: The actual test is a secret to prove what's in their heart.
* SecretlyDying: A character hides the fact that they have a terminal illness or lethal wound.
* SecretlyWealthy: A character hides the fact that they're fabulously wealthy.
* SecretWeapon: A hidden weapon typically revealed during or near the climax of a work.
* SecretWord: It's not going to be "[[ThePassWordIsAlwaysSwordfish swordfish]]".
* SharedMassHallucination: An believable explanation designed to cover-up something, similar to GasLeakCoverup.
* [[TheyreCalledPersonalIssuesForAReason They're Called Personal Issues for a Reason]]: Secrets that, when discovered, only reveal embarrassing and unimportant information.
* ThisPageWillSelfDestruct: A self-destruct mechanism is built into a device which relays secret information.
* TownWithADarkSecret: A town hides a secret from outsiders.
* UndercoverWhenAlone: Keeping a secret even when no one is around to find out about it.
* UnmanlySecret: A man hides his love of something stereotypically not masculine.
* WainscotSociety: A whole second social system exists in close parallel to the "normal" world.
* WaterSourceTampering: They don't want you to know what you're really drinking.
* WeHaveBeenResearchingPhlebotinumForYears: Turns out these folks knew about the weird stuff all along.
* WelcomedToTheMasquerade: A character is introduced to a secret society.
* WeWouldHaveToldYouBut: A character has to be kept in the dark about something in order for the plan to work out.