13th Cavalry may refer to:
Divisions 13th Cavalry Division (Russian Empire) 13th Cavalry Division (Soviet Union) 13th Guards Cavalry Division, Soviet Union
Brigades 13th Cavalry Brigade (British Indian Army) 13th Indian Cavalry Brigade
Regiments 13th Cavalry Regiment (United States) 13th Hussars 13th Lancers 13th Duke of Connaught's Lancers (Watson’s Horse) 13th Reserve Cavalry Regiment 13th/18th Royal Hussars XIII Corps Cavalry Regiment
American Civil War regiments Union Army 13th Indiana Cavalry Regiment 13th Illinois Cavalry Regiment 13th Kentucky Cavalry Regiment 13th Ohio Cavalry Regiment 13th Pennsylvania Cavalry Regiment 13th Tennessee Cavalry Regiment
Confederate Army 13th Missouri Cavalry Regiment 13th Texas Cavalry Regiment 13th Virginia Cavalry Regiment
Battalions 13th (Irish) Battalion, Imperial Yeomanry
See also 13th Division (disambiguation) 13th Brigade (disambiguation) 13th Regiment (disambiguation)