A fan wiki is a wiki that is created by fans, primarily to document an object of popular culture. Fan wikis cover television shows, film franchises, video games, comic books, sports, and other topics. They are a part of fandoms, which are subcultures dedicated to a common popular culture interest. The digital humanities scholar Jason Mittell stated in 2013 that fan wikis were "[o]ne of the most popular and widespread uses of wikis".

Fan wikis were first published in the early 2000s. Many fan wikis formed out of Wikipedia over disputes among editors about the level of detail that should be provided in articles. These included fans of the television show Battlestar Galactica and the Star Wars franchise, who founded Wookieepedia after facing complaints about the "overabundance of minutiae related to Star Wars appearing on Wikipedia".

The following list summarizes fan wikis with articles on Wikipedia.