Unreal Tournament 2004, also known as UT2K4  and UT2004, is a futuristic first-person shooter computer game developed by Epic Games and Digital Extremes. It is part of the Unreal series of games and is the sequel to 2002's Unreal Tournament 2003 and the original Unreal Tournament.

Among significant changes to gameplay mechanics and visual presentation, one of the major additions introduced by Unreal Tournament 2004 is the inclusion of vehicles and the Onslaught game type, allowing for large-scale battles.