Street Fighter II: The World Warrior (ストリートファイターⅡ Sutorīto Faitā Tsū?) is a 1991 fighting game produced by Capcom, originally released as an arcade game. A sequel to Street Fighter, Street Fighter II improved upon many of the concepts introduced in the first game, including the use of command-based special moves and a six-button control configuration, while offering players a selection of multiple playable characters, each with their own unique fighting style and special moves.

Street Fighter II is credited with starting a fighting game boom during the 1990s. Its popularity led to the production of several updated versions, each offering additional features and characters over previous versions, as well as many home versions; the game itself also established many of the core concepts of the fighting game genre. Some of the home versions of the Street Fighter II games have sold millions of copies, with the SNES port of the first Street Fighter II being Capcom's best-selling consumer game of all-time as of 2008.