11 Corps, 11th Corps, Eleventh Corps, or XI Corps may refer to:
11th Army Corps (France) XI Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars XI Corps (German Empire), a unit of the Imperial German Army XI Army Corps (Wehrmacht), a unit of the Nazi German Army XI Corps (India) XI Army Corps (Italy) XI Corps (Ottoman Empire) 11th Army Corps (Russian Empire) 11th Army Corps (Russian Federation) XI Corps (Pakistan), a unit of the Pakistani Army XI Army Corps (Spain) 11th Army Corps (Ukraine) XI Corps (United Kingdom), a unit of the British Army XI Corps (United States), a unit of the United States Army XI Corps (Union Army), a unit in the American Civil War
See also List of military corps by number 11th Army (disambiguation) 11th Division (disambiguation) 11th Brigade (disambiguation) 11th Regiment (disambiguation) 11th Squadron (disambiguation) 11th Battalion (disambiguation)