XXI Corps Cavalry Regiment (21st Corps Cavalry Regiment) was a composite mounted regiment of the British Army made up from separate squadrons of Yeomanry cavalry. It served under XXI Corps Headquarters in Palestine during World War I, seeing action at the Third Battle of Gaza with the seizure of Wadi el Hesi and Junction Station, and at the Battles of Jaffa and Tell 'Asur. After reorganisation in the summer of 1918, XXI Corps participated in the Battle of Megiddo, when it broke through the Turkish lines at the Battle of Sharon, and its cavalry regiment led the pursuit up the coast of present-day Lebanon. The regiment reached Tripoli before hostilities ended.