The 103rd Light Anti-Aircraft Regiment, Royal Artillery, (103rd LAA Rgt) was an air defence unit of the British Army during World War II. Initially raised as an infantry battalion of the East Lancashire Regiment in 1940, it transferred to the Royal Artillery in 1941. It served in Northern England and Northern Ireland but saw no active service. Shortly before D Day, it was broken up to reinforce other units that fought in the campaign in North West Europe.