Simply put, two characters who aren't in a romantic relationship pretend to be.
- The Beard: When it's done to hide at least one party's sexuality.
- Boyfriend Bluff: A usually temporary version done to stave off harassment and/or unwanted attention.
- Citizenship Marriage: They get married so one party can legally immigrate.
- It Meant Something to Me: A member of the ruse falls for the other.
- Operation: Jealousy: When the relationship is faked to get the attention of one party's actual object of interest and make them envious.
- Publicity Stunt Relationship: When this is done to benefit a celebrity's public image and/or boost their career.
- Romantic Fake–Real Turn: When they develop real feelings while pretending to be in a fake relationship.
- Shock Value Relationship: Declaring someone is a significant other just to shock other people.
- Undercover as Lovers: When it's done as part of a disguise.
Please only add examples that don't fit on these subtropes.
Compare Trial-Period Dating, when two characters date (with genuine romantic interest on the part of one of the two) on the condition that the relationship lasts for a finite period of time. Contrast Secret Relationship. See also Fake-Out Make-Out, Marriage Before Romance (when the fake relationship becomes real) and Marriage of Convenience. Compare the one-sided Intentional Heartbreaker.
- Seigi pretends to be Richard's boyfriend (against Richard's wishes!) in The Case Files of Jeweler Richard so he can pretend to marry Richard and save him from a will. They don't actually get married.
- Full Metal Panic!: Mizuki does this when her boyfriend, Shirai, dumps her only days before she was to going to introduce him to her middle-school friends and prove she wasn't just making him up. Desperate to save face, she decides to recruit the best-looking guy that will humor her request to pose as Shirai for the duration of the date. Unfortunately for her, the boy she ended up recruiting was Sousuke, and things go very, very badly
- In Koi to Uso, there are severe social consequences for not going through with your Bureaucratically Arranged Marriage. Yajima and his arranged fiance feel no connection and haven't willingly spent time together in years (in large part because he still loves his ex-girlfriend), but both claim to be in love and ready to marry any day because otherwise their careers would be in jeopardy.
- In Magical Warfare, the protagonist Takeshi Nanase established a fake relationship with his childhood friend Kurumi Isoshima in order to ward off numerous men who pursue her, especially after a traumatic incident with a stalker.
- Ranma ˝:
- One of these occurs after Ukyo mistakes Ranma's guilt induced kindness as affection, leading her to try getting closer to him and even start living with him. So in order to get Ukyo to leave, Ranma and Akane are forced to pretend to already be married, when they're actually just reluctantly engaged at that point. It doesn't fool Ukyo though who keeps making moves towards Ranma.
- This occurs during one of the most confusing love triangles ever to exist. Ukyo finds herself being pursued by Tsubasa. So in order to try and get rid of Tsubasa, seemingly a girl who loves dressing up, Ukyo pretends to be in a full blooming relationship with Ranma (they are supposedly engaged, but haven't become serious). However, given Ranma is a Sex Shifter and Ukyo dresses like a boy, she told Tsubasa that she was with Ranma's girl form. Upon finally being rejected by Ukyo enough times, Tsubasa gives up and starts falling for girl Ranma. The kicker is that, Tsubasa is actually a boy crossdressing and always knew that Ukyo was secretly a girl, rather than a girl attracted to girls as Ranma and Akane had initially thought. Meanwhile Ukyo always knew that (because they first met at a boys only school) Tsubasa was a boy. But they never asked.
- In Scum's Wish, Hanabi Yasuraoka and Mugi Awaya are going out together, but they both love someone else — their teachers.
- In Spy X Family Loid and Yor start a fake relationship for their own reasons: Loid wants to get his daughter Anya into an elite school and will look more legitimate with a wife, and Yor wants to escape the scrutiny cast on unwed women in the ultra-paranoid Cold War-esque climate of their country. The twist is Loid - aka the elite spy <Twilight> - wants to get his "daughter" (who he recently adopted for the mission) into the school to get close to his mark, while Yor - aka the deadly assassin <Thorn Princess> - wants to avoid suspicion so as not to interfere with her job. Further complicating things are the fact that Anya is a telepath (who knows her "parents'" real jobs), and she and the dog they later obtain(who can predict the future) both do what they can to uphold the charade because they want to keep their family.
- In Red Robin Tim wakes up after being treated for injuries in the Batcave to have Damian shove a newspaper in his face declaring to a shocked Tim that Tim is engaged to Tam Fox. Tam had panicked while being questioned by Vicky Vale and blurted out that they were engaged to redirect her line of questioning. They keep the charade going for a week or so because they're trying to distract Vicky from her attempt to uncover the Batfamily's secret identities.
- The whole plot of Roadqueen: Eternal Roadtrip To Love revolves around Leo and Vega "fake-dating" for a week in order for Leo to prove she can be a great girlfriend and "decent lesbian" so Vega will return her beloved motorcycle.
- Archive of Our Own has a lot of fics with the tag "Fake/Pretend Relationship".
- A one-sided example occurs in Convenient Amnesia - upon learning that Optimus Prime has amnesia, Starscream pretends that they are Conjunx Endura in order to manipulate Prime into attacking Megatron.
- Guys Being Dudes: This was Arlo's original plan in seducing Spark. His plan is that getting with her coworker will prompt Candela to try to win him back as part of an Operation: Jealousy. Suffice to say, it didn't go as planned.
- Innocent (MarauderLover7): After Rita Skeeter accuses Remus of having an affair with Fleur Delacour, Harry persuades Fleur into a pretense that they're dating, both to distract the public and provide an alibi for her presence. She's not thrilled by the idea, but agrees to it long enough to achieve their goals before publicly breaking up.
- In Lost in Camelot, after Lancelot breaks things off with Gwen when he realises that she has come to develop deeper feelings for Arthur, Kenzi suggests that he fake being in a relationship with her so that Arthur and Gwen don't feel awkward about being happy while he's miserable. Naturally Kenzi soon finds herself falling for Lancelot for real.
- The Stargate SG-1 "A Pretense of Romance" sees Daniel suggest that he pretend to date Sam to inspire Jack O'Neill to ask her out after she's been discharged from the Air Force and SG-1 but allowed to remain in the SGC (Sam resigned as she refused to obey the orders of General Bauer- "Chain Reaction"- and was unable to re-enlist as certain parties argued that she might disagree with other orders in future). The plan was to get Jack jealous to acknowledge his feelings for Sam and then she and Daniel would amicably break it off, but things take a different turn when Daniel finds himself developing genuine feelings for Sam.
- The Price of Fame has Adrien forced by his father to date Lila, since she knows how to drum up attention and play to the cameras.
Gabriel: Date her for the sake of the business, son. It doesn't matter if you're in love when you're like us.
- Slip Knot is a "Five Things" Fic that involves Caleb and Beauregard pretending to be married for various reasons. Hilarity Ensues.
- White Sheep (RWBY): Weiss claims Jaune is her boyfriend to throw her sister Winter off the scent when Winter comes too close to discovering the illegal events they were recently involved in (they botched a police sting operation). Funnily enough, Weiss is one of the only named female characters who isn't secretly in love with Jaune. The ones who are, however, are surprisingly okay with the fake relationship, since Jaune is too honest to take advantage. Besides, they're also on the hook for the illegal stuff if Winter investigates too closely.
- With Pearl and Ruby Glowing: Due to the cast of the original Total Drama going missing and the Ark luring people with a fake second season campaign, Chris McLean's reputation was damaged, so he pretended to be gay and in a relationship with one of his interns. When his "boyfriend" assaulted him for not giving him a raise, it came out that Chris lied and the public took the intern's side over his.
- Wrong Road to the Right Place: Once Laurel starts working with Team Arrow, she and Oliver 'pretend' to start dating again to justify the time they're spending together. It becomes increasingly difficult to tell if they're faking it or actually dating, until they admit that they still love each other in Chapter 15.
- In Victor/Victoria, when Victoria starts masquerading as the female impersonator Victor, she and Toddy pretend to be lovers.
- There’s a Star Wars Legends arc where Lando Calrissian and Mara Jade pretend to be in a relationship while working undercover on a smuggling job.
- In the Warrior Cats book Bluestar's Prophecy, Bluefur became pregnant as the result of a Forbidden Romance with a cat from another Clan. Her Clanmate Thrushpelt - who she was friends with and who had unrequited feelings for her - offered to pretend that he was the father in order to help her out. Bluefur decided to not outright tell everyone that he was, Thrushpelt still loved the kits as if they were his own and behaved as if they were, and both of them were fine with everyone assuming that they were mates.
- In Dark Olympus, Hades and Persephone fake being in a relationship after her fake abduction, to deter Zeus from his plans to marry her, since he only marries virgins.
- The Barrier: Hugo, who was secretly recently widowed, really needs a job. The opening he gets via an old friend of his mother-in-law expects a married couple to show up. It just so happens that Hugo's wife had a twin sister who is still alive. One of the side effects of the deception is that they need to pretend to be married. Fortunately, this is relatively easy to fake because Hugo's sister-in-law cares deeply about him and his daughter.
- Booth and Brennan did this several times on Bones before getting together for real. They went undercover as "Buck and Wanda" a couple of times, and once they did it at Brennan's school reunion.
- Cheers: When Carla's ex-husband invites her to his wedding Diane suggests Carla take a fake boyfriend with her to make it look like she's moved on. Carla asks Sam to do it as he's the only decent-looking guy in the bar. Diane, who's actually dating Sam, is wary until she meets the ex-husband and sees just how big a jerk he is.
- In the Doctor Who episode "The Time of the Doctor", Clara accidentally told her relatives that she had a boyfriend, leading her to call the Doctor in a blind panic.
Clara: Emergency: you're my boyfriend.
The Doctor: Ding dong, okay, brilliant! I may be a bit rusty in some areas but I will glance at a manual!
Clara: No no, you're not actually my boyfriend.
The Doctor: (disappointed) Oh, that was quick. It's a rollercoaster, this phone call.
Clara: But I need a boyfriend really quickly!
The Doctor: Well, I hope you're nicer to the next one.
- Frasier pretends to be Roz's date at a family reunion when she's recently been dumped and can't face her competitive, passive-aggressive sisters.
- Martin pretends to date the mother of Frasier's Sitcom Arch-Nemesis as a prank on the pair of them.
- Get Smart: Two KAOS agents once pretended to be in love, sharing a public kiss to escape detection by CONTROL. Max and 99 likewise often masqueraded as a married couple on missions before they got hitched for real.
- Ghosts Pete pretends to date one of the furnace stokers to avoid facing eternal humiliation from Alberta's rejection.
- Hacks: Kayla lied that she and Jimmy were married so they could get a luxury honeymoon suite in Vegas.
- In a season one episode of Hannah Montana, Miley tells Jake that she's dating a graduate student named Will, who has agreed to pose as her boyfriend. Unfortunately for her, Will is 11 years old, graduated from elementary school, and only agreed to the pretend relationship when dared to by his friends.
- How I Met Your Mother: While Lily is broken up from Marshall, she is looking for a place to live and persuades Barney to let her stay with him for a few days. He is at first reluctant, but after one of his one-night stands refuses to leave, Lily manages to scare her away after the girl sees her and assumes she's Barney's wife. They spend the next few weeks pretending to be married. Their arrangement falls apart once Barney realizes even pretending to be married is too close to actually being married and he kicks Lily out.
Lily: Hi, Barney. (sees girl) Oh...
Girl: Oh my God, are you married? Is this your wife?
- Lucifer: When Lucifer breaks up with Eve, Eve begs Maze to pretend to be her girlfriend in order to make Lucifer jealous.
- The premise of the britcom Spaced is that the main characters believe they have a Single-Issue Landlord who will only rent the flat to a couple. It eventually turns out this was all based on a misprinted advertisement.
- The Wire: Cedric Daniels actually was in a relationship with his wife Marla (obviously), but they have secretly broken up just when her career in politics is about to take off. Daniels is actually involved with Pearlman at that point, but for public appearance's sake, he still shows up to a dinner his wife is hosting for several important guests before going upstairs to wait until they're gone.
- In Ridgeside Village, during Faye's 6 heart event she is given a surprise visit by her parents who start pressuring her to come back home and study to become a doctor; if the player chooses not to intervene, Bryle (with whom she constantly bickers) who's passing nearby, will, and when Faye's parents question him on who he is, Faye blurts out that he's her boyfriend. Afterwards when her parent leave, Faye says that they must continue with the charade otherwise her parents will be suspicious. Later, in her 8 heart event after Bryle helps her set up her fashion show and it's a resounding success, he asks her if she would like to end the charade now, after which she becomes sad, and says that no, she wants to continue with it, since now he can be her bodyguard, while she giggles.
- In Sable's Grimoire the titular Sable can pretend to be dating the mandragora Eth in order to allow their mutual friend, the rokurokubi Rei, to get over her one-sided crush on Sable. It's left ambiguous whether Sable and Eth may transition into a real relationship later.
- Spirit Hunter: NG:
- To distract the guard at the Urashima Lake, Seiji and Kaoru pretend to be lovers in the middle of an argument. To Seiji's surprise, and the player's amusement, Kaoru ad-libs that she's pregnant and goes off on a rant against the hapless guard.
- To lure out a spirit that supposedly only attacks couples, Kaoru brings along Akira (whom she's already had Ship Tease with) and pretends that they're together.
- Piofiore: Fated Memories:
- In Nicola's route, he tells Roberto that he and Lili are in a relationship and that is why she is staying at the Falzone Mafia manor with him, when the truth is a bit different. However, Roberto becomes increasingly jealous and would later attempt to kill Nicola partly because of it.
- In his route, Yang indicates to his gang that Lili is his woman and even tells Dante and Gilbert that it was love at first sight. He only said this so people wouldn't act too many questions as Lili was actually kidnapped to be used as a bargaining chip against the Falzone Family and the Church.
- Collar × Malice:
- In Sasazuka's route, early on he pretends to be Ichika's boyfriend as an excuse for him to come to her house during dinner so he could meet Kazuki's friend Akito, who is suspected to be part of the terrorist group Adonis.
- In Shiraishi's route, to stop Mukai from seeing the collar on a drunk and passed out Ichika, he tells Mukai that she wouldn't want to see the hickey he left on Ichika's neck. Ichika's hesitation to show Mukai and Sakuragawa her neck later only "proved" she was dating Shiraishi.
- Miss Abbott and the Doctor: Cati and Andreas pretended to be a couple the first time they met a year before the strip's events, so Cati could avoid the farm lady she stole a goat from.
- To Love Your Enemy:
- Zigzagged with Yikyung and Yeonhee. She initially spreads rumors that she and Yikyung are a thing to get him to talk to her, then tries to call it off. But then Yikyung's father tries to drag him into an arranged marriage, he tells her that since everyone thinks they are dating anyway, he may as well use it to try and get out of said arranged marriage.
- Discussed when Yikyung proposes more formally fake dating her: she derides contract relationships as a fantasy.
- In Disenchantment, Elfo makes up a Girlfriend in a Faraway Land to try to distract from his obvious feelings for Bean. Unfortunately, Bean wants to "reunite" them, and her knights bring back Tess, a giantess who happens to fit the description Elfo gave. Elfo begs Tess to maintain the lie through the upcoming royal ball.
- Fry on Futurama gets himself into a fake relationship triangle. First he pretends to be Amy's boyfriend so that her parents would stop trying to set her up with men. Later he pretends to be Leela's boyfriend so that Zapp Brannigan will stop hitting on her. This becomes awkward when all of them are having dinner at the captain's table in front of both Amy's parents and Zapp.
- In Goof Troop, Max convinced his attractive older cousin, Debbie, to pretend to be his girlfriend in an attempt to impress the cooler kids. It worked, though with the added complication of one of them trying to "steal" her from Max.
- In The Proud Family, Penny and Sticky get into one of these because the former (begrudgingly) wanted to assist the latter in gaining back Dijonay's affections for him.
- South Park: In the episode "About Last Night", it is revealed that Barack Obama and Michelle Obama aren't actually married, but it is all a ruse for getting Obama into office so he and McCain can steal an expensive diamond. At the end of the episode, Barack decides to be president after all and asks Michelle to stay with him.
- In the episode "Tweek x Craig," Tweek and Craig pretend to date to satisfy the school's Yaoi artists. They stage a fake breakup, making the entire town fall into depression. They get back together and realize they have feelings for each other. After this episode, Tweek and Craig stay together the rest of the series.
- In Tangled: The Series, Cassandra is revealed to have been courting a mysterious man named Andrew. It is revealed, however that it was fake on both ends— he was doing it to steal an important artifact and she was aware, playing along in the efforts to catch him and expose him, in an attempt to prove her worth as a guard.