The 117th Light Anti-Aircraft Regiment, Royal Artillery, (117th LAA Rgt) was an air defence unit of the British Army during World War II. Initially raised as an infantry battalion of the Royal Ulster Rifles (RUR) in 1940, it transferred to the Royal Artillery in 1942. It served in Tunisia, Malta, Sicily and Italy (including the notorious Air raid on Bari) before being broken up in 1944 and the gunners converted back into infantrymen.