Warhammer 40,000: Rites of War, is a game using the Living Battlefield series based the Warhammer 40k tabletop game. It is SSI's second such adaptation.

There are four major armies, each taken from Warhammer 40k: Eldar, Tyranids, Imperial Guard, and Space Marines. Each army has strengths and weaknesses. Space marines are balanced between shooting and close combat. Tyranids are an army that excels in close combat. Imperial Guard are tilted more towards shooting, and the Eldar are also have a balance, but they use many more psychic powers than each of the other races.