|See also:||Mary Sue, Anywhere But Here, Tuckerized|
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Self-insertion is a practice by authors of writing themselves into their own stories, either explicitly or in thinly-disguised form.
A lesser practice is fan artists incorporating themselves, or other fans, into fanart.
Mary Sues are often self-insert characters, although they tend to be idealized rather than realistic versions of their authors. Authors may also write self-inserts as humor (for example, in metafic featuring an author arguing with her characters) or as an in-joke (for example, making an extremely minor character a self-insert that will only be recognized by friends).
Self-insertion in Canon
Richard Brautigan's unnamed narrator in The Abortion and his one fantasy novel In Watermelon Sugar is often presumed by fans to be a character based closely upon himself. He explicitly uses a character named Richard Brautigan in "The Lost Chapter of Trout Fishing In America".
Amy Tan based several of her characters on herself, her mother and her grandmother, retelling actual events in their lives in The Joy Luck Club, The Kitchen God's Wife and The Bonesetter's Daughter.
Agatha Christie's mystery novelist Ariadne Oliver has what Christie called a "strong dash" of herself. Like Christie, Oliver writes in the bath while eating apples. When she tries to help Hercule Poirot solve crimes, she often makes the same mistakes Christie herself made in her books.
Robert A. Heinlein's Lazarus Long in The Moon is a Harsh Mistress and Jubal Harshaw in Stranger in a Strange Land voice Heinlein's real political and social opinions, often convincing others that they are right. Harshaw seems to have earned most of his extreme wealth by writing, simply being very productive and using a lot of pseudonyms.
Admitted Self-Insertion in Fan Fiction
- MEST #18 was a Special THRUSH Appreciation Issue (Man from UNCLE). It has 10 pages and was published in 1965 by Ted Johnstone for inclusion in the Amateur Press Association (APA) Spectator Amateur Press Society (SAPS) mailing #71. The issue features the story of a hoax played by Johnstone and local fans pretending to be from the evil THRUSH organization from The Man from UNCLE. 
- Just to show how differently fans thought about self-insertion in those days, Regina Marvinny held a contest in the pages of Tricorder Readings, her Nimoyan Federation LNAF-affiliated clubzine. Entrants were supposed to write a story about themselves meeting Spock. Karen Flanery misunderstood and wrote a lighthearted novella that had Leonard Nimoy visiting her for a day. It was so good they published it anyway.
- In Mark's Leaps, a Quantum Leap zine, the author is one of the main characters.
- Authors in Forever Knight Wars post multiple self-insertion fics in a giant round-robin style RPG in which anywhere up to 300 fans take part by joining teams (called factions), each of which is affiliated with a character or pairing from the show. It is one of the rules of war that one plays oneself, more or less warts and all, without any special abilities. The function of war is to get to know one's fellow fans, though characters from the series are also written into the story.
- In 2002, the Highlander Holy Ground Forum held a Mary Sue challenge as part of their weekly series of challenges. "Write a (mercifully) short story or vignette in the Highlander universe featuring a character who is obviously a classic Mary or Marty Sue. Extra points for hitting as many of the typical plot and character clichés as you can manage. Roll up your sleeves and show us your worst!" 15 stories were collected.
- Many Role-Playing Game groups have sessions where the players attempt to write themselves up as characters, often resulting in much argument over the game's method of ranking intelligence and attractiveness.
- From the editors' description of the zine Fantazy, "[It is a] media-oriented zine featuring both original universe and existing universe/prose/poetry/scripts starring your favorite actors/actresses - AND - yourself! This is your chance to write yourself into a story and appear in the illo! We encourage it!"
- see more at Zine Wiki