XVIII Corps

18 Corps, 18th Corps, Eighteenth Corps, or XVIII Corps may refer to:


 * 18th Army Corps (France)
 * XVIII Army Corps (Wehrmacht), a unit of the German Army
 * XVIII Corps (German Empire)
 * XVIII Reserve Corps (German Empire)
 * XVIII Corps (Ottoman Empire)
 * XVIII Corps (United Kingdom)
 * XVIII Airborne Corps, United States
 * XVIII Corps (Union Army), a unit in the American Civil War