Call of Duty 4 Modern Warfare is a first-person shooter video game developed by Infinity Ward and published by Activision. The game breaks away from the World War II setting of previous entries in the series and is instead set in modern times.

The year is 2011, and civil war has broken out in Russia between the Russian government and Russian ultranationalists under the command of Imran Zakhaev who seek to restore Russia back to its former Soviet-style leadership. A revolution has toppled a regime in an unnamed Arabic country which has ties to the Russian ultranationalists, with Khaled al-Asad coming to power. These two simultaneous events are causing fear that al-Asad and Zakhaev might form an alliance and use nuclear weapons against the West. In response to these concerns, the United States and the United Kingdom conduct joint operations to put down both uprisings.

The conflicts are seen from the perspectives of a U.S. Force Reconnaissance Marine and a British SAS commando, and are set in various locales, such as the United Kingdom, the Middle East, Azerbaijan, Russia, and Ukraine.

• Call of Duty 4 Modern Warfare