Call of Duty 4: Modern Warfare was released for consoles and Windows in North America on November 5, 2007, in Australia on November 7, 2007, and in Europe on November 9, 2007. The Mac OS X version of the game was developed by Aspyr and released on September 26, 2008.

PC players: Call of Duty: Modern Warfare III uses the Call of Duty HQ to launch the game. When downloading or launching the game, look for Call of Duty in the store or your game library.