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, and Wii. It is the third and final installment in the original Modern Warfare saga, a direct sequel to 2009's Call of Duty: Modern Warfare 2, and the eighth Call of Duty installment overall.

The game's campaign follows Modern Warfare 2 and begins right after the events of its final mission. Similar to Modern Warfare 2, it is centered around the Task Force 141, which contains Captain Price, Soap MacTavish, and Yuri, one of the playable characters. Alongside the Delta Force and Special Air Service, they hunt Vladimir Makarov (antagonist of Modern Warfare 2), a Russian terrorist who leads the Russian Ultranationalist party. He leads several terror attacks across Europe, triggering a large-scale war between the Ultranationalists and friendly forces. For the game's multiplayer mode, new mode types and killstreak choices were brought in. Improvements were also made to the mode that solved issues that appeared in Modern Warfare 2.