The 56th (King's Own) Anti-Tank Regiment was a Territorial Army unit of the British Army's Royal Artillery (RA), which converted from the 4th Battalion, King's Own Royal Regiment (Lancaster). During the Second World War, it first served with the 42nd (East Lancashire) Division in the Battle of France and Dunkirk evacuation in May–June 1940. In 1942, it was sent to join the 70th Infantry Division in India, where it was converted into a Light Anti-Aircraft/Anti-Tank Regiment. In this guise, it served in the Burma Campaign, mainly with the 5th Indian Infantry Division. It reconverted to the anti-tank role in late 1944 and in June 1945 it returned to India as a training unit. It continued serving in the TA postwar until 1961, when it re-merged into the King's Own.