The 105th Light Anti-Aircraft Regiment, Royal Artillery, (105th LAA Rgt) was an air defence unit of the British Army during World War II. Initially raised as an infantry battalion of the Dorsetshire Regiment in 1940, it transferred to the Royal Artillery in 1941. It served with V Corps in the Allied landings in North Africa (Operation Torch). It later defended vital points during the campaign in Italy until it was disbanded in June 1944 to provide infantry reinforcements.