FanFiction.Net (often abbreviated as FF.Net or FFN) is an automated fan fiction archive site. It was founded in 1998 by Los Angeles computer programmer Xing Li, who also runs the site. As of 2010^[update], FanFiction.Net is the largest and most popular fan fiction website in the world. It has nearly 2.2 million users and hosts stories in over 30 languages.

The site is split into nine main categories: Anime/Manga, Books, Cartoons, Miscellaneous, Games, Comics, Movies, Plays/Musicals, and TV Shows. As of March 27, 2009, a new feature was added to the site - the Crossover categories. Users who complete the free registration process can submit their fan fiction, maintain a user profile, review other stories, apply for a beta reader position, contact each other via email or private messages, and maintain a list of favorite stories and authors. There are also centralized communities and forums.

In 1998 Xing Li, a software designer in Los Angeles, created FanFiction.net. The site was created as a repository for fan-created stories that revolved around characters from popular literature, television, comics, or real-world celebrities. Unlike other fan fiction sites, FanFiction.Net allowed stories about any characters rather than revolve around a specific set of characters, such as those from Naruto, Harry Potter or Kingdom Hearts. Registration was open to all people who claimed to be over 18, and by 2002 over 118,000 people were registered. (The age limit has since been moved down to 13.) At that time, one-third of the registrants self-identified as 18 or younger, and 80% were female.

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