Wikia (formerly Wikicities) is a free web hosting service for wikis (or wiki farm). It is normally free of charge for readers and editors, deriving most of its income from advertising, and publishes all user-provided text under copyleft licenses. Wikia hosts several hundred thousand wikis using the open-source wiki software MediaWiki. Its operator, Wikia, Inc., is a for-profit Delaware company founded in late 2004 by Jimmy Wales and Angela Beesley – respectively Chairman Emeritus and Advisory Board member of the Wikimedia Foundation – and headed by Craig Palmer as CEO.

On February 8, 2012, Beesley announced she was leaving Wikia to launch a startup called ChalkDrop.com.

Wikia spent over a year going by the name "Wikicities" (inviting comparisons to GeoCities), but changed its name to "Wikia" on March 27, 2006, saying that "the name Wikicities has often caused confusion, with many people believing it was a site for city guides rather than wikis about any topic." In the month before the move, Wikia announced a US$4 million venture capital investment from Bessemer Venture Partners and First Round Capital. Nine months later, Amazon.com invested US$10 million in Series B funding, with Senior VP of Business Development Jeff Blackburn joining the company board.

Jimmy Donal "Jimbo" Wales ( /ˈdoʊnəl ˈweɪlz/; born August 7, 1966) is an American Internet entrepreneur best known as a co-founder and promoter of the online non-profit encyclopedia Wikipedia and the Wikia company. Wales was born in Huntsville, Alabama, United States, where he attended Randolph School, a university-preparatory school, then earned bachelor’s and master’s degrees in finance. While in graduate school, he taught at two universities, but left before completing a PhD in order to take a job in finance and later worked as the research director of a Chicago futures and options firm. In 1996, he and two partners founded Bomis, a male-oriented web portal featuring entertainment and adult content. The company would provide the initial funding for the peer-reviewed free encyclopedia Nupedia (2000–2003) and its successor, Wikipedia.

On January 15, 2001, with Larry Sanger and others, Wales launched Wikipedia, a free, open content encyclopedia that enjoyed rapid growth and popularity, and as Wikipedia’s public profile grew, he became the project’s promoter and spokesman. He is historically cited as a co-founder of Wikipedia, though he has disputed the "co-" designation, declaring himself the sole founder. Wales serves on the Board of Trustees of the Wikimedia Foundation, the non-profit charitable organization he helped establish to operate Wikipedia, holding its board-appointed "community founder" seat. In 2004, he co-founded Wikia, a for-profit wiki-hosting service. His role in creating Wikipedia, which has become the world’s largest encyclopedia, prompted Time magazine to name him in its 2006 list of the world’s most influential people.