Great War is an alternative term for World War I. It may also refer to:

Works of popular culture

• Great War (Harry Turtledove), an alternate history trilogy by Harry Turtledove.
• The Great War (documentary), a 1964 BBC documentary series.
• The Great War (1959 film), an Italian/French film.
• The Great War (2007 film), a Canadian TV film.
• The Great World War (Command & Conquer), the war in Command & Conquer: Red Alert.
• Descent: FreeSpace – The Great War, a computer game.
• The Great War of 2077, the war that destroyed the world in the Fallout universe.
• The Great War, the war between the Lombaxes and the Cragmites in Ratchet & Clank Future: Tools of Destruction
• The Great War, a history by Les Carlyon.
• Great War (Transformers), the war between the Autobots and Decepticons in The Transformers.
• The Great War (album), a 2010 album by Justin Currie.

Other

• The Great War (battle honour), Canadian battle honor awarded for services in World War I
• Great Patriotic War (term), Russian name for World War II
• The Great War, Paraguayan name for the War of the Triple Alliance
• The Great War, Uruguayan name for the Uruguayan Civil War
• The Great War, Polish name for the Polish–Lithuanian–Teutonic War
• The Ten Years' War between Spain and Cuba
• Great War Island, a river island in Serbia, located at the mouth of the Sava River