"It measures gayness. With science."The ability to determine a person's sexual orientation without being explicitly told — or rather, the ability to detect gay people who haven't outed themselves to you. (Gaydar presumably can detect straight people as well by process of elimination; but in media depictions, it generally isn't.) This may require anything from a casual glance, to hearing the target speak, to near constant observation. Can be confounded by the presence of a Camp Straight, but not always. Much depends on how much the gaydar depends on gay stereotypes. Can also rely heavily on an observer's common wisdom and intuition based on life experience, with good gaydar being measured by its probability of success, making this Truth in Television. (Compare Transparent Closet for gaydar's easiest detections.) The term is a combination of the words "gay" and "radar". This trope can be very close to LGBT Fanbase, especially where an observer likes what they see, is using Shipping Goggles, or otherwise is practicing some form of wishful thinking. But just as often, Gaydar can be perfectly sincere audience interpretation, whether or not there is also LGBT Fanbase — use caution when calling Fan Yay on someone's Gaydar. See also: Flying Under the Gaydar.
—Doctor Insano, The Spoony Experiment
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Anime & Manga
- Ryou from Strawberry Shake Sweet has a rather powerful one; she can instantly tell the sexuality of a woman with just a mere glance and can also apparently tell when a lesbian has officially come to terms with her sexuality.
- Y: The Last Man: Dr Mann mentions that an old colleague of Agent 355's reminds her of an ex. When Yorick asks "She reminds you of an ex-boyfriend?", Dr Mann points out that's not what she said. One Beat Panel later, Yorick expresses disbelief at how he's been traveling with her for a year without realising, and she mentions that they can add gaydar to the other common senses he seems to lack. Although that said, the whole Gendercide thing and its logical consequences would play hell with even the most finely-tuned gaydar.
- This exchange in the 1968 film The Detective:
Colin McIver: How could you know?
Teddy Leikman: We know each other. Something about the way you walked. Something about the eyes.
- In the short story "Am I Blue?", the main character gets a form of this, identifying gay people by the color blue. Also in the short story, everyone from coast to coast gets a form of this too, for twenty-four hours. Both were a result of wishes granted by his fairy godfather.
"Gaydar. Automatic sensing system that lets you spot people of similar persuasion. A lot of gay guys have it to some degree or other. If it was more reliable, it make would life easier on us.''
- Interestingly, in Russia "Blue" (specifically, "light blue") is the euphemism for gay male.
- The mundane version of the trope is also mentioned by name and discussed:
- In Earth (The Book), Jon Stewart explains that some humans had more than the standard 5 senses, one of which was called "gaydar". He admits that, while it was not very useful for survival, it did provide for hours of bitchy fun at parties.
- In The Wheel of Time, Pevara Tazanovi, after spending some time with Emarin Pendaloan, is able to tell that he prefers men, and casually mentions this to his friend Androl during a discussion about relationships. Androl is flabbergasted.
- In the third book of Sword of Truth, Richard is floored when he realizes two of his bodyguards, Raina and Berdine, are lovers. At the end of the book, Richard's girlfriend Kahlan meets them. When Berdine makes a dirty joke about Richard grabbing her breasts, Kahlan responds by saying her breasts are just perfect for Raina's hands. Richard is floored again that Kahlan was able to figure it out so easily.
Live Action Television
- Game of Thrones: Ser Jaime Lannister claims to have known that Lord Renly Baratheon was a "tulip" from the moment the boy first arrived at court.
- On Sherlock Sherlock is able to tell a man is gay just by being introduced to him, much to the dismay of his girlfriend. It helps that he left his number under one of Sherlock's petri dishes.
- Though in a nice twist, the man actually isn't gay, but was intentionally giving off subtle gay signals since he is Moriarty, Sherlock's nemesis and a genius like him.
- Since Sherlock at one point thinks John is making romantic overtures toward him this may be an Inverted Trope: one of the few glaring holes in his powers of observation and deduction.
- On The Office, Jim "helps" Dwight order a literal gaydar online so he can help Michael avoid embarrassing gay employees in the future. At the end of the episode, the fake gaydar (actually a metal detector) arrives and of course, identifies Dwight as gay (and his belt buckle as metal).
- A The Daily Show segment had Ed Helms invent one, detecting background levels of gayness via increasingly campy phrases. He said that since it worked as a radar for gayness, he'd call it a "Homometer."
- By the way, it's pronounced 'Hoe-MAW-me-ter'.
- A bit fuzzy on the details, but it is used to detect heterosexuality in one episode of MTV's Undressed. A woman in college is concerned that her boyfriend isn't sleeping with her, so she goes to a gay friend who, after asking her a few questions about her, decides that he is definitely straight.
- Mentioned in Friends. Chandler's gay coworker implies that this is how he knew Chandler wasn't gay.
Chandler: So- you can tell?Lowell: Pretty much, most of the time. We have a kind of... radar.
- In a Season 7 episode of Buffy the Vampire Slayer, Willow tells Kennedy she wishes that she had some sort of "lesbidar".
Kennedy You do know there's a much better word for that, right?
- In a Season 4 episode, Faith in Buffy's body could tell Willow and Tara were dating before anyone else did.
- Glee: Santana. This is how she figures Karofsky out.
Santana: I'm a closet lesbian and a judgemental bitch - which means one thing: I have awesome gaydar.
- It also helps that he was blatantly checking out Sam's ass.
- He was checking out his jeans!
- Nate claims to have this in an early episode of Six Feet Under after effectively fixing his gay brother up on a date. David tells him not to say it again.
- There used to be a reality show Called Gay, Straight, or Taken? where single women would spend some time with three men and try to use their gaydar to figure out which one was gay, straight and single, or straight and taken.
- On the American Life On Mars, Annie has figured out that a man they're questioning is gay, listing several behavioral cues she'd noticed during questioning that Sam was oblivious to.
Sam: Women always have better gaydar.Annie: "Gaydar." I like that.
- South of Nowhere: Spencer and Ashley are talking about a girl who may or may not have hitted on Spencer.
Ashley: You are so clueless sometimes. You know she is gay, right?
Spencer: What? She is not. You need to reboot your gaydar.
Ashley: Whatever. I just hope it is better than your breeder-meter.
Spencer: Why is it that every gay person are so sure that everyone else is gay?
Ashley: Oh, not everyone. Just the gay ones.
- On Smash, Ivy says Tom's gaydar is stupid when she tells him that her sports-loving friend Sam is gay.
Tom: Heís gay?!Ivy: Where have you been?Tom: Why didnít you tell me?Ivy: Who knew your gaydar was so stupid?Tom: My gaydar is not stupid. I do not have stupid gaydar. Ugh, I hate that word.
- A recurring sketch on Saturday Night Live is about Nicole, "The Girl with No Gaydar." She is always marvelling at a man's interior design sense or similar stereotypically gay interest while being oblivious to their gayness.
- Thirteen actually uses the word in an episode of House when trying to diagnose a patient, claiming that it has never been wrong. Except it turns out to be wrong in this case, as the "female" patient is actually a heterosexual male.
- The "Blind Spot" episode of  revolves around Louis Huang having a perfectly functional gaydar while his wife Jessica's is utterly broken... then again, he's got a broken love-dar.
- Elle's gaydar in Legally Blonde helps her discredit a witness by proving he wasn't having an affair with a defendant. What tips her off is when he doesn't react to the "bend & snap", but a heated discussion with co-counsel ensues about whether other traits mark him as "Gay or European". He's both.
- In the original movie the Gaydar is set off in a different manner - he criticized her shoes as being out of season Pradas. Also, he's exposed by Emmett tricking him in denouncing his boyfriend who openly decries his lies in anger. "You Bitch," indeed.
- Roll from Bob and George says she has this, but if this works or not depends on if you believe Mega Man X X and Zero are actually gay or just Heterosexual Life-Partners.
- Saturday Morning Breakfast Cereal has the page picture showing how it can be used for actual emergency navigation.
- Under comments in news section "This is the navy we're talking about here, there'd be too much interference from the crew."
- Referred by name in this Misfile strip. Kinda subverted as the 'gay' detected there is actually a boy turned into a girl.
- There's a literal gaydar in I Was Kidnapped By Lesbian Pirates From Outer Space!!! It's how the eponymous Space Pirates first detect the protagonist, when she's attracted to a female co-worker.
- Beth from Better Days claims to have an exceptional gaydar. It's an Informed Ability though, since there aren't any gay people in the comic, except for Flounce and he and Beth have no interaction.
- In Rain, not only is the gaydar mentioned, but the idea of a "transceiver", which functions as a gaydar for trans people is thrown around. The joke is that Rain's is defective.
- Saundra of Umlaut House once built one, it blew up when she tested it on Rick and gave an inconsistent reading when she tried it on Volair
- Denmark claims to get this after five beers in Scandinavia and the World. Sweden thinks he is just listing all the women he wants to see have lesbian sex.
- Marten's mother in Questionable Content isn't gay herself, but she's a very experienced Dominatrix. Her first, totally accurate, reaction on meeting Tai is "OH MY GOD I LOVE THE TINY BUTCH ONES."
- Spinnerette wishes her spider senses came with gaydar.
- Homestuck: Roxy claims to have one that is very oversensitive, as a counterpart to Jane who doesn't have one at all.
TG: my gaydar is like the exanct fuckin poposite of ursTG: which is to say it is better than completety nonexistantTG: mine is so sensitive it has been used to sweep the ocean floor for mythical sea monstersTG: turns outTG: all of those monsters are SO gayTG: truth B)
- Ethan sets off everybody's gaydar despite being very Straight Gay (save for his interest in My Little Pony, which is less a function of being gay and more a function of being a toy nerd.)
- Sarah claims to have one of these, and is perfectly willing to spread rumors based on it.
- Alan of Sunstone was subjected to some measure of harassment in college due to him setting off a good number of people's mistuned gaydars.
- Catalina of El Goonish Shive seems to have a malfunctioning gaydar, judging by the fact that she asked Susan out on a date, and assumed that Elliot broke up with Sarah because he realized he was gay. Both these characters are straight. This was lampshaded in a non-canon sketchbook entry where she was shown ordering a literal gaydar from the back of a comic book.
- Dr. Insano has one as shown in Spoony's review of Beastmaster 2: Through the Portal of Time. An effeminate French stereotype causes it to self-destruct. When Spoony asks why Insano would ever need a gaydar, Insano evades the question. In the commentary for that review, Spoony reveals that this caused fans to suspect that Insano was gay himself.
- The gay men's dating website gaydar.com.
- Yu-Gi-Oh! The Abridged Series changes Bakura's Millennium Item detection ability into a Gaydar.
- Bender in Futurama has actual gaydar. Whether it works or not is questionable.
- Stan from American Dad! also has one, but it didn't seem to work since it kept pointing at [straight] even when he was talking to a gay guy,
- On The Simpsons, Homer is tasked by Marge with finding a potential suitor for either Patty or Selma. When he assesses Mr. Smithers, he notes, "Possible Homer-sexual."
- Various studies indicate people really can identify the sexuality of men from just photos at a level greater than chance, even when things like facial hair, jewelry and hairstyle are controlled for.
- Though not completely related, there's the "transdar". It's mostly related to whether a person "passes" or not, or how they behave pre-transition.
- There's the suggestion that the greater exposure and acceptance of gay people in society increases the odds of a person correctly identifying someone who is gay because of the acceptance that gay people actually exist and don't all look like drag queens. People from a less open culture (or an older generation) are less likely recognize someone as being gay because it's hard to recognize something that you refuse to accept.
- A 2005 study had discovered that people can smell people's sexual orientation by body odor. For homosexual male participants, there was a consistent preference for homosexual males over heterosexual males or homosexual females, under the forced-choice paradigm. This suggests that smell is one way of how the gaydar could work.