13 Corps, 13th Corps, Thirteenth Corps, or XIII Corps may refer to:
XIII Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars XIII (Royal Württemberg) Corps, a unit of the Imperial German Army XIII Corps (Ottoman Empire) XIII Corps (United Kingdom) XIII Army Corps (Wehrmacht), a German unit in the Second World War XIII Corps (United States) XIII Corps (Union Army), a unit in the American Civil War
See also 13th Army (disambiguation) 13th Battalion (disambiguation) 13th Brigade (disambiguation) 13th Division (disambiguation) 13th Group (disambiguation) 13th Regiment (disambiguation) 13 Squadron (disambiguation)