FanFiction.Net (often abbreviated as FF.Net or FFN) is an automated fan fiction archive site. It was founded on October 15, 1998 by Los Angeles computer programmer Xing Li, who also runs the site. As of 2005, FanFiction.Net is the largest and most popular fan fiction website in the world. It has nearly 1.3 million users, and hosts more than 3.5 million stories,[citation needed] for thousands of fandoms[citation needed] and in over 30 languages.[1] The site is split into eight main categories: Anime/Manga, Books, Cartoons, Miscellaneous, Games, Comics, Movies, and TV Shows. Users who complete the free registration process can submit their fan fiction, maintain a user profile, review other stories, contact each other via email or private messages, and maintain a list of favorite stories and authors. There are also centralized communities and forums.

Community content is available under CC-BY-SA unless otherwise noted.