A fan wiki is a wiki created by fans of a popular culture topic. Fan wikis, which are a part of fandoms, cover television shows, film franchises, video games, comics, sports, and other topics. The primary purpose of a fan wiki is to document its topic area through collaborative editing. Fan wikis document their subjects at varying levels of detail. They also serve narrative and creative functions. Some present analysis, fan theories and fiction, and video game strategy guides and walkthroughs, while others only document official canon. Media and cultural studies scholars have studied fan wikis as forms of participatory culture that enable fans to build community.
Fan wikis were first published in the early-to-mid-2000s, some as a result of fans collaborating on Wikipedia and then forming their own separate wikis. Many fan wikis are hosted on Fandom, a for-profit wiki hosting service. Since the mid-2010s, some fan wiki communities have left Fandom over disagreements about advertising, outdated software, and corporate control.