Fox may refer to:
- FOX, a CIA covert operations group that was led by Major Zero during the Cold War.
- FOXHOUND, an elite black ops unit of the United States Army that was established by the "Legendary Soldier" Big Boss.
- Gray Fox, a mercenary and former agent of U.S. Special Forces Unit FOXHOUND.
- FOXDIE, an engineered retrovirus developed by the DIA for the Pentagon.
- FOXALIVE, a computer virus designed to completely destroy GW and other Patriot AIs, upon being installed directly onto GW's server.
- Fox Engine, a cross-platform game engine created by Kojima Productions.
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