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

Other wars

• War of the Triple Alliance (1864–1870) between Paraguay and the alliance of Argentina, Brazil, and Uruguay
• Great Northern War (1700–1721) between Russia and Sweden
• Great Turkish War (17th century), series of conflicts between the Ottoman Empire and contemporary European powers
• Uruguayan Civil War (1839–1851)
• Great French War: French Revolutionary Wars (1792–1802) and Napoleonic Wars (1803–1815)

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 name for the war in Command & Conquer: Red Alert
• Descent: FreeSpace — The Great War, a computer game

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
• Great War Island, a river island in Serbia, located at the mouth of the Sava River

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