4 Corps, 4th Corps, Fourth Corps, or IV Corps may refer to:
France 4th Army Corps (France) IV Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars IV Corps (Grande Armée), a unit of the Imperial French Army during the Napoleonic Wars
Germany IV Cavalry Corps (German Empire), a unit of the Imperial German Army IV Corps (German Empire), a unit of the Imperial German Army IV Reserve Corps (German Empire), a unit of the Imperial German Army IV Army Corps (Wehrmacht), a unit of the German Army in World War II
Soviet Union 4th Airborne Corps (Soviet Union) 4th Guards Army Corps 4th Guards Cavalry Corps 4th Cavalry Corps (Soviet Union) 4th Guards Mechanized Corps 4th Mechanized Corps (Soviet Union) 4th Rifle Corps 4th Guards Tank Corps
United States IV Corps (United States) IV Corps (Union Army) Fourth Corps, Army of Northern Virginia Fourth Army Corps (Spanish–American War)
Others 4th Army Corps (Armenia) 4th Army Corps (Azerbaijan) IV Army Corps (Greece) IV Corps (Hungary) IV Corps (India) IV Corps (North Korea) IV Corps (Ottoman Empire) IV Corps (Pakistan) 4th Territorial Army Corps (Romania) IV Corps (South Vietnam) IV Army Corps (Spain) IV Corps (United Kingdom) 4th Corps (Vietnam People's Army) IV Corps (Finland, Winter War) IV Corps (Finland, Continuation War)
See also List of military corps by number 4th Army (disambiguation) 4th Brigade (disambiguation) 4th Division (disambiguation) 4th Regiment (disambiguation) 4th Squadron (disambiguation)