The King of Fighters XI (KOF XI) is a 2D fighting game produced by SNK Playmore. It is the eleventh installment in The King of Fighters series following The King of Fighters 2003. It was originally released as a coin-operated arcade game for the Atomiswave platform in 2005. A home version for the PlayStation 2 was released in Japan in 2006, followed by releases in the PAL region and North America in 2007. It is the second The King of Fighters game to not run on the Neo Geo following its predecessor, The King of Fighters Neowave and also the first major canonical entry to not be named after its year of release.

SNK Corporation is a Japanese video game hardware and software company. It is the successor to the company Shin Nihon Kikaku and presently owns the SNK video game brand and the Neo Geo video game platform, and electronics. SNK's predecessor Shin Nihon Kikaku Corporation was founded in 1978 by Eikichi Kawasaki. In 1981, the name was informally shortened to SNK Corporation, which became the company's official name in 1986.