14 Corps, 14th Corps, Fourteenth Corps, or XIV Corps may refer to:
- XIV Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars
- XIV Corps (German Empire), a unit of the Imperial German Army prior to and during World War I
- XIV Reserve Corps (German Empire), a unit of the Imperial German Army during World War I
- XIV Corps (India)
- XIV Corps (Ottoman Empire)
- 14th Army Corps (Russian Empire), a unit of the Imperial Russian Army between 1877 and 1918
- 14th Army Corps (Russian Federation), a unit of the Russian Ground Forces since 2016
- XIV Corps (United Kingdom)
- XIV Corps (United States)
- XIV Corps (Union Army), a unit in the American Civil War