World at War could be an alternative name for World War II

World(s) at War may also refer to:

• Another name for the Darkness Series (2000–2005) by Harry Turtledove
• The World at War (film) (1942), propaganda film produced by the Office of War Information
• The World at War (1973–74), British television series documenting World War II
• Call of Duty: World at War (2008), video game developed by Treyarch
• Gary Grigsby's World at War (2005), computer wargame developed by 2 by 3 Games
• Left Behind: World at War (2005), video film, second sequel to Left Behind
• Worlds at War, a 1989 video game
• A World at War, a board game that evolved out of Rise and Decline of the Third Reich