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- A Certain Scientific Railgun is a variation in which three out of the Four-Girl Ensemble detectives have super-powers. Toyed with in that two of the girls are actually official law enforcement personnel.
- CLAMP School Detectives tells the adventures of the Elementary School Student-board, solving cases and easing the life of all kinds of women.
- Death Note: The kids from Wammy's House seem to have shades of this, being a group of orphan geniuses raised to find the kid that will one day become L's successor. Near, especially, seems to fit early on, with his childish appearance and love of toys. He is, however, taken perfectly seriously by the authorities, if considered a tad unorthodox.
- Detective Conan is a 17-year-old de-aged down to seven. Since everyone thinks he's seven, he has to find ways of cluing adults in disguised as being a nosy seven-year-old. There's also Ayumi, Genta, and Mitsuhiko, the "Detective Boys." As they're actual kids themselves, they aren't quite up to snuff as true Kid Detectives yet. They do try, though.
- Future Diary: Akise when he is introduced is a Kid Detective.
- The obscure OVA Girl Detective Club would be about this trope focusing on three private school girls, Yuriko, Shizuka, and Midori... except beyond the title no club is actually mentioned and the only mystery the girls solve concerns Midori's disappearance. It turns out she was abducted by the school chairman so he could steal some kind of war machine hidden in her family's mansion and then use it to take over the world. But then Yuriko and Shizuka accidentally find it, turn it on, and obliviously pave a swath of destruction through the city on their way to rescue Midori. It's a... very weird piece of animation.
- Lupin III (Red Jacket) had Baranco, a one-episode character who was the son of the famous Columbo. The entire police force is willing to follow his plans.
- Majin Tantei Nougami Neuro is a subversion. Although Yako is supposed to be the leader of the detective agency (and she is billed as such), Neuro is the one doing all the detective work and is using her as a front. Later on, it is hinted that Yako is actually a semi-competent detective on her own, though.
- Mythical Detective Loki Ragnarok has Loki from mythology as an apparent kid detective, though he's Really 700 Years Old.
- Fuyuki from Sgt. Frog ends up acting in this capacity in a few episodes of the anime.
- Narutaki from Steam Detectives, son of Steam City's greatest detective and a child genius.
- The aptly named "Sleuth Brigade" from The Voynich Hotel try to be this, but fail frequently, as they are constantly bogged down by their own issues and the usual weirdness doesn't make any attempt to conceal itself.
- The Dead Boy Detectives are permanent kid detectives for, you know, obvious reasons.
- Tubby from Little Lulu occasionally acted as one, whenever Lulu needed his help with a problem at her house.
- Cat Curio in Hack/Slash is a deconstruction when she's first introduced, showing what it would really be like for a preteen to stick her nose in murder cases. She's extremely observant and ingenuous, but the police find her anything but helpful, she seems to have no concept of danger, and her snooping almost gets her killed.
- Instead of dying, she was put in a coma for 13 years. When she awakes, she returns to her work as a detective and starts her own agency, but obviously she still has the mind of a 12-year-old autistic girl.
- Parodied with Young Jack Black in Viz, who is an extreme-right-wing Jerkass who often inflicts Disproportionate Retribution on people who, in some cases, weren't even doing anything legally or morally wrong.
- FoxTrot: In one arc, Jason and Marcus become kid detectives, using the name 'Encyclopedias Brown and White'. As with most of their schemes, this one goes off the rails.
- The Facing the Future Series features Mike Harris, a boy at Elm Street Middle School who likes to snoop on things and may be on the road to learning Danielle's secret.
- Turnabout Storm: Apple Bloom tags along Twilight in her investigation at one point. She doesn't do much proper investigation, but she does make Twilight stumble upon several pieces of evidence, and has a moment of useful Genre Savvyness. Scootaloo tries to do this, but she just picks up some random junk as her "evidence", and doesn't show up until after the Judge has handed down his final verdict anyway.
- In Gravity Falls fic Home Is Where The Haunt Is, Mr. Mason is quick to make fun of Dipper for trying to be one.
- Mystery Team is a Parody of this character type. The main characters are 18-year-olds still stuck in their crime-solving days and are Man Children. To increase their actual cred, they take on a little girl's case, which involves looking for her parents' murderer.
- Clubhouse Detectives, about a group of kids who work together to solve the murder of an opera writer's wife.
- There was an entire spinoff Mystery series of The Baby-Sitters Club based on this trope.
- Flavia Gemini of The Roman Mysteries is a Kid Detective in The Roman Empire. She is assisted by three friends and various adults.
- The title character in Joe Meno's book, The Boy Detective Fails, is a deconstruction of what this trope might become when they enter adulthood.
- PK Pinkerton in the The Western Mysteries.
- Natalia in the Grey Griffins series carries a notebook to write down clues and figure things out. She sometimes snoops around on her own and tries to discover things, separate from her group of friends. Through most of the story, she is more of an adventurer than a snoop, though she still is often the one to piece together clues.
- Cam Jansen is an elementary schooler who uses her Photographic Memory to remember exact details and use them to solve crimes.
- The same author has a boy character named Jeffery Bones with his own series.
- Encyclopedia Brown. Notable here is the fact that his father is a police officer who knows of his son's activities, and is somewhat embarrassed that the smartest detective in town is a fifth-grader.
- The Hardy Boys, who, at 17 and 18, are two of the oldest examples of "kid" detectives out there, though they were originally 15 and 16.
- Nancy Drew: Nancy is a young but brilliant teenage girl solves mysteries with the help of her two best friends and her understanding father.
- The Dana Girls.
- Trixie Belden (and the rest of the Bobwhites) are teen detectives in the Hudson Valley. Thanks to Trixie's rich best friend Honey Wheeler, they frequently go on trips and conveniently solve mysteries wherever they go.
- The ten-year-old members of the McGurk Detective Agency, led by the clever if perhaps overly-impetuous Jack P. McGurk.
- Enid Blyton's Famous Five. And Secret Seven. And Five Find-Outers. And others.
- Paul-Jacques Bonzon's Les Six Compagnons, the French counterparts of Enid Blyton's Kid Detective series.
- Parodied with Malicia in Terry Pratchett's The Amazing Maurice and His Educated Rodents, who likes to think of herself as one of these, but is really just an obnoxious know-it-all who's not quite Genre Savvy enough.
- Marjorie Weinman Sharmat's Nate the Great.
- Alan Coren's Arthur The Boy Detective, who lives at 221A Baker Street, and constantly shows up his downstairs neighbour.
- Justin Richards' The Invisible Detective novels are about a group of kids who claim to be "Baker Street Irregulars" to the non-existent Brandon Lake, because no-one would take them seriously as detectives themselves.
- A couple of Kim Newman's Diogenes Club stories include Richard Riddle, Boy Detective.
- A darker, deconstructed version also appears in Newman's "Clubland Heroes" with Richard "Clever Dick" Cleaver; he's an off-the-scale detective genius who, unlike the more pleasant and engaging Richard Riddle, is also a snide, stuck-up and humourless little snot. And then when he appears in "Cold Snap" following the ignominious end of his child-detecting career, he's let bitterness warp him into a genocidal maniac.
- The Boxcar Children: The titular children.
- Jill Pinkwater's The Disappearance of Sister Perfect has Sherelee Holmes, who, after deducing that her runaway sister has joined a cult, poses as a rich teenager several years older than herself and infiltrates the organization.
- Walter "Ramses" Emerson was an example (a master of disguise among other things) until, over the course of the series, he grew up. He is the child of Amelia Peabody and Radcliffe Emerson, a Battle Couple pair of Egyptologists and incidental detectives in a series by Elizabeth Peters. Ramses has since grown up, gotten married, and produced his own frighteningly precocious children. His mother feels it serves him right.
"Now, Mama, Papa, and sir," said Ramses, "please withdraw to the farthest corner and crouch down with your backs turned. It is as I feared: we will never break through by this method. The walls are eight feet thick. Fortunately I brought along a little nitroglycerine—"
- Note that in the following passage, rescuing his parents, Ramses is about eight or nine:
"Oh, good Gad," shrieked Inspector Cuff.
- Emil and the Detectives has about 50 kid detectives.
- Played with in an Esp Mcgee book where the book's kid Watson decides to personally visit the home when the kid suspect is out to get some information. As it happens, he barely manages to excuse himself when the suspect and his menacing father arrive home early. Afterward, the terrifying experience weighs so much on him that he confesses to his parents what he was up to. His alarmed parents give him a firm lecture about taking such risks, but playfully then suggest that since he's done it, he might as well contact Mcgee to give his report, which proves to crack the case.
- Ten-year-old Esmine plays this role in In The Snows Of Haz. He's only one of several characters trying to solve the murders, though, and spends decent part of the plot locked in a room or running from bad guys. He does pretty well, all considered.
- Fletcher Moon in Eoin Colfer's Half Moon Investigations (now a CBBC series).
- Nick Diamond, brother of the incompetent Tim Diamond in the Diamond Brothers series by Anthony Horowitz.
- The Shirley Holmes stories depict the exploits of a certain detective's sleuthing teenaged sister. (Not to be confused with the TV series, which they inspired.)
- Astrid Lindgren's Kalle Blomkvist, translated into English as Bill Bergson. He's thirteen to fifteen in the books and played quite realistically. He has a hyperactive imagination but enough analytical skills and knowledge of real detective procedures (like taking fingerprints, and even chemically detecting arsenic) to find real evidence against them when he's finally confronted with real criminals. Together with his friends, he's also resourceful enough, and suitably experienced in pretend warfare of sorts against their friendly rivals, to make it through sticky situations involving dangerous adults.
- The Great Brain series by J.D. Fitzgerald — the Great Brain Himself, when there's a serious crime to solve. Subverted in that when there isn't, the Great Brain is more likely to be swindling other kids out of their pocket change.
- In the earlier Harry Potter books, Harry, Ron and Hermione fit this pretty well, and this element runs through all the books.
- Sugar Creek Gang: These evangelical Christian-themed books feature kid detectives having wilderness adventures. And a lot of preaching.
- TKKG falls into this category, combining it with a Five-Man Band. Also the problem with the authorities is not that big because the father of one of the kids is with the police. And since in later books they also have a reputation for solving crime.
- Agatha Christie's Crooked House: Twelve-year-old Josephine investigates the murder of her grandfather, using her naturally snoopy nature to provide clues that the outsiders to the family never manage to find. However, it then turns out she's the murderer, having decided to kill her grandfather over his not getting her ballet lessons. She had decided to investigate the murder to get further attention from her family and the police. The subversion naturally comes from the fact that readers had been led to believe she was a genuine Kid Detective, before we find out what was really going on.
- Enola Holmes: Enola is the much younger sister of Sherlock Holmes. At only 14, she is able to live independently, establish a successful detective business through a lot of misdirection and elude her brothers' best efforts to capture her until they wise up about her.
- The Stanley family in Zilpha Keatley Snyder's loose series of books about them. The concept is partly deconstructed with Janie's Private Eyes, where 8-year-old Janie ends up causing nothing but headache and trouble with her investigations.
- The Sweetness At The Bottom Of The Pie: Flavia de Luce is a great example. She also has some Mad Scientist tendencies that lead to her being an eleven-year-old expert on poisons.
- Harriet from Donna Tartt's The Little Friend, who plans on solving the decade old case of her brother's murder. Deconstructed as she has absolutely no bearing on what to do - as nobody wants to discuss the murder as it practically destroyed the family - and is acting like her favorite fictional heroes, getting herself and others into unrelated trouble. She goes entirely on hearsay and jumps to the utterly wrong conclusions while ending up severely injuring an old woman by throwing a poisonous snake into her car (believing it to be driven by the murderer), accidentally killing one of her brother's friends (believing him to be the murderer with no evidence at all) and causing herself serious bodily harm, while "killing" said friend. She did accidentally stop illegal drug dealing without knowing that it was drug dealing.
- Lasse and Maja from Swedish author Martin Widmark's Lasse-Majas Detektivbyrå-stories (20+ books, a TV series, The Movie...). They have no trouble convincing the local chief of police of their findings - while well-meaning and competent, he is still unable to solve any crime without their help, so...
- Alfred Hitchcock's The Three Investigators, long-running multinational book series.
- Inspector Tearle appeared in five books in the late 60s and early 70s. He and his sidekicks, his athletic sister and his Watsonesque best friend, solved cases from a treehouse headquarters.
- Brains Benton and his Watson, Jimmy Carson, solved six cases in the late 50s and early 60s. Brains himself was a strong Sherlock Holmes expy, and possibly (for his age) even a better scientific detective.
- Max the Wolf from Down The Mysterly River is this.
- Dink, Josh and Ruth Rose in the A to Z Mysteries series.
- Capitol Mysteries and Calendar Mysteries are by the same author with different kids.
- The Three Cousins Detective Club series was one of these with three cousins.
- Ziggy And The Black Dinosaurs is a series where the kids are African-American.
- Dalton Rev, the teen Hardboiled Detective in You Killed Wesley Payne.
- Dwight of the Origami Yoda series carries around an origami finger puppet of Yoda and gives people advice with it. Occasionally, he tries to help people without Origami Yoda, and when doing so, goes into Kid Detective mode. He imitates Sherlock Holmes and speaks in a British accent.
- The Detective Team KZ in Tantei Team KZ Jiken Note is a group of seventh-grade Amateur Sleuth.
- Some of the Choose Your Own Adventure books feature kid detectives and their adventures. i.e., Mytery of Ura Senke features an American pre-teen who has solved cases in the past; he/she moves to Japan with his/her family and is contacted by their best friend Kenichi, whose brother is a student in the Ura Senke tea ceremony school, to find the school's most valious tea bowl, which has been stolen and is worth millions of yen.
- A group of four young carnival freaks, Thomas the Contortionist, Max the Knife thrower, Sam the World's strongest boy, and Pippa the Mentalist, solving the occasional murder mystery is the basis of the Curiosity House series. Even if the Police Are Useless, the kids will try to let the authorities do their job unless a friend or the tourist trap where they live and work hangs in the balance.
- Terrance Dicks wrote a children's series called The Baker Street Irregulars about a Sherlock Holmes fan who (with the help of his school friends) would solve crimes. The first mystery he only takes on after the school bully dares him to, but he finds that he's actually quite good at it.
Live Action TV
- The Bloodhound Gang on 3-2-1 Contact are a whole detective agency of kids.
- PBS's Ghostwriter involves kids and a ghost who solve mysteries. The ghost communicates only by typing, as it cannot speak.
- The title character in Letty, a popular UK children's series during the 1980s.
- The Adventures of Shirley Holmes, starring Sherlock's teenaged great grand-niece.
- Subverted in the 1970s TV version of The Hardy Boys where the Boys are allowed to grow up in the final season and become professional detectives for the US Department of Justice.
- The Sarah Jane Adventures Has an investigative journalist and three teens investigate and fight aliens.
- Stick With Me Kid was a British series where the kid detective got around his age by using an out of work actor to pose as a detective while the kid did all the actual detective work.
- The Baker Street Boys: A gang of street urchins living in Victorian London assist Sherlock Holmes in solving crimes and find themselves tackling cases of their own.
- Flavia Gemini and friends in Roman Mysteries, the CBBC live action adaptation of The Roman Mysteries books.
- Eugenie Sandler PI. was an Australian TV series about a teenage girl whose father is private investigator. When he disappears, she is forced to turn detective in order to find him.
- Ted Mosby of How I Met Your Mother claimed to have been one in his youth, teaming with his sister as "The Mosby Boys". His friends don't think much of his detective skills, but they are portrayed inconsistently throughout the series and there were cases where he was quite insightful in putting clues together such as in "Blitzgiving".
- Ten-year-old Angus Mcdonald of The Adventure Zone is this to a tee. In Angus's introduction, Merle cites this trope almost by name.
Angus: My name's Angus Mcdonald, that part you already know. I am, and I'm not being braggy, 'cause my grandpa says not to do that, but I am the world's greatest detective!Travis (narrating for Magnus): I roll my eyes.Angus: Okay. I mean, I did detective good enough to see through your horseshit, so I can't be too bad.Merle: Are you saying you're a boy detective?Angus: If you want to be reductive.
- Naoto Shirogane of Persona 4, who's known all across Japan as the "Detective Prince". Dissected, as well: the police force hates having to call Naoto in on the serial murder case, and she's passed herself off as a boy for years because of how male-dominated the police are. Her Shadow taunts her over how mature she tries to act to get past the "young detective" bit - it's worth noting that her Shadow flip-flops between overly mature dialog and crying like a baby.
- Goro Akechi from Persona 5 appears to be a Naoto-like Kid Detective, to the point where he's known as "The Second Coming of the Detective Prince", but since the heroes are on the other side of the law, he has a more antagonistic relationship to them at first. It turns out that he's a Fake Ultimate Hero who's the true culprit behind all of the cases he "solved".
- Mackenzie from Touch Detective is a Born Detective in the Kid Detective phase of her life.
- Jake and Jennifer Eagle in the 1993-94 Eagle Eye Mysteries PC game series.
- Suikoden III has a Kid Detective named, wait for it, Kidd. His look also seems to be heavily inspired by Detective Conan.
- As each of the characters in Guilty Party is based on a classic detective archetype, Rudy (AKA Kid Riddles) represents this particular trope. His cousin Ling-Ling is one too, but she's a teenager and skews more towards being a Nancy Drew-alike.
- Kyouko Kirigiri of Danganronpa may be the most extreme application of this trope: as the Ultimate Detective, she's essentially the best in the world for her age-group, and as a requirement of that title, is a professional in her daily life (which can be seen in her prequel novels where she's taking on cases while still in junior high). With the world outside the academy gone to hell with so few people left alive, she may actually be the best in general by default.
- In Kingdom Hearts II, Sora takes on a detective role in Timeless River to figure out who has been attacking Disney Castle, using the windows as clues. It was obviously Pete, but there are two versions of him here. In the Japanese version, the cutscene where Pete reappears to steal the Cornerstone of Light is even called "Detective Sora".
- The second trip to Halloween Town also has a mystery as its theme; this time, on who stole the Christmas presents from Santa Claus. However, Sora doesn't play the detective role this time; Jack Skellington does.
- Parodied with the Mystery Solving Teens from Hark! A Vagrant - unlike most teenage detectives, they act like typical teenagers, meaning they rarely do anything relevant to the case.
- The kids from Bad Machinery regularly deal with crimes and mysteries, mostly with a supernatural spin.
- This trope is somewhat subverted in "The Case Of The Forked Road", where after the kids consider all sorts of devious ways to fool railway men into pulling the levers to switch a train to a different track to prevent a crash, or to get the men out of the way so they can pull the levers themselves, Shauna finally takes the direct, straightforward approach as an adult investigator might, and tells the men that the track has been sabotaged and they need to flip the switch; and they believe her and take immediate action.
- Scooby-Doo: Despite the fact that the main characters are constantly referred to as "meddling kids" and variants thereof by the various villains of the week upon capture, most incarnations of the franchise don't fit the trope since they're teenagers, not children. A Pup Named Scooby-Doo, on the other hand, does qualify, featuring child versions of the characters.
- Penny, the niece of Inspector Gadget, is well-known for her snooping, her being captured, and her ability to stop the bad guys singlehandedly every single episode.
- This is what Hank and Dean, The Venture Bros., want to be. This is what the Giant Boy Detective is.
- The Simpsons has done this numerous times with Bart and/or Lisa. The first such instance is when Krusty gets arrested for armed robbery but some sleuthing discovers that it was actually Sideshow Bob trying to frame Krusty. Nelson also takes it up later on, with Bart and Lisa being the suspects.
- Numbuh 2 of Codename: Kids Next Door occasionally acts as one, complete with noir film-esque narration.
- Fillmore! is a cop version of this trope; the title character is a hall monitor at his middle school.
- The Amazing Chan and the Chan Clan. The youngest four fit the role perfectly, especially Flip, but the others are teens.
- Timmy Turner from The Fairly OddParents! ventured into this trope in the episode Where's Wanda when he wished to become a full, typical private investigator; trench coat and all.
- The entire premise of Sally Bollywood, whose title character is also a Born Detective.
- Dipper and Mabel became these in the Gravity Falls episode "Headhunters", when they set out to solve the mystery of who beheaded a wax sculpture of their Grunkle Stan.
- Oh Yeah! Cartoons featured a short about a child detective entitled "Peter Patrick, P.I.: What About Lunch?"
- While nowhere near as common as in fiction, you do get occasional cases of children and (more often) teenagers who have gone "above and beyond" to save the lives of bystanders and help apprehend criminals. Needless to say, they don't typically end up making a habit of it.