15th Corps, Fifteenth Corps, or XV Corps may refer to:
XV Corps (British India) XV Corps (German Empire), a unit of the Imperial German Army prior to and during World War I 15th Army Corps (Russian Empire), a unit in World War I XV Royal Bavarian Reserve Corps, a unit of the Bavarian Army and the Imperial German Army during World War I XV Army Corps (Wehrmacht), Germany XV Mountain Corps (Wehrmacht), Germany XV Corps (India) XV Corps (Ottoman Empire), a unit in World War I XV Corps (United States), a unit in World War II XV Corps (Union Army), a unit in the American Civil War XV Corps (United Kingdom), a unit in World War I 15th Rifle Corps, a Soviet unit World War II XV SS Cossack Cavalry Corps, a German unit in World War II 15th Airborne Corps, airborne corps of the Chinese Air Force 15th Tank Corps, tank corps of the Soviet Union's Red Army
See also List of military corps by number 15th Army (disambiguation) 15th Division (disambiguation) 15th Group (disambiguation) 15th Wing (disambiguation) 15th Brigade (disambiguation) 15th Regiment (disambiguation) 15 Squadron (disambiguation)