Call of Duty: Modern Warfare 3 is a 2011 first-person shooter video game, jointly developed by Infinity Ward and Sledgehammer Games and published by Activision. The game was released worldwide in November 2011 for Microsoft Windows, the Xbox 360, PlayStation 3, Wii, and OS X. It is the sequel to Call of Duty: Modern Warfare 2 (2009), serving as the third and final installment in the original Modern Warfare trilogy and the eighth Call of Duty installment overall. A separate version for the Nintendo DS was developed by n-Space, while Treyarch developed the game's Wii port. In Japan, Square Enix published the game with a separate subtitled and dubbed version.

Activision Publishing, Inc. is an American video game publisher based in Santa Monica, California. It serves as the publishing business for its parent company, Activision Blizzard, and consists of several subsidiary studios. Activision is one of the largest third-party video game publishers in the world and was the top United States publisher in 2016.