HMS Mackay was an Admiralty type, sometimes known as the Scott class, flotilla leader of the British Royal Navy. Mackay was built by Cammell Laird during the First World War, but was completed too late for service then, commissioning in 1919. Mackay took part in the British campaign in the Baltic during the Russian Civil War, and was still in service at the start of the Second World War. The ship took part in the Dunkirk evacuation in 1940 and the Normandy landings in 1944, spending most of the rest of the war operating on the East coast of Britain. Mackay was scrapped from June 1949.