Dead or Alive 4 is a 2005 fighting game developed by Team Ninja and published by Tecmo for the Xbox 360. It is the fourth main entry in the Dead or Alive fighting series.

The story of the game focuses on the continuing war between the Mugen Tenshin Ninja Clan and DOATEC, and Helena Douglas taking over the mantle of DOATEC as its new president, determined to fight against the corruption within the enormous organization. The game's story mode introduces the player to new characters and opponents via combat which can then be played in the game's other modes.