MV Ulster Queen was a passenger ferry operated across the Irish Sea between 1930 and 1940.

She became an auxiliary anti-aircraft cruiser, HMS Ulster Queen and never returned to civilian service.

The Belfast Steamship Co. received three 3,700 ton Harland and Wolff-built motorships in 1929 and 1930, the world's first diesel cross-channel ships.

[2] Ulster Queen ran aground off Maughold Head on the Isle of Man on 28 February 1940.

Commissioned as HMS Ulster Queen, she was purchased outright by the Admiralty and served with the Russian convoys, in the Mediterranean and in the Far East before being paid off on 1 April 1946.