Warhammer: Mark of Chaos (PC) is a real-time tactics wargame set in the Warhammer universe. It was produced by Namco, developed by Black Hole Entertainment and distributed by Deep Silver. Though not a sequel or related to these, Warhammer: Mark of Chaos is the third real-time tactics title based on the Warhammer Fantasy Battle tabletop game rules following Warhammer: Shadow of the Horned Rat (1995) and Warhammer: Dark Omen (1998) by Mindscape.

The game, according to the developers, is a game "focusing on the armies and battles while de-emphasizing the tedious aspects of base and resource management". Set in the Warhammer Old World, the player can command one of 4 armies from the tabletop game.