HMS Belfast is a Town-class light cruiser that was built for the Royal Navy. She is permanently moored as a museum ship on the River Thames in London and is operated by the Imperial War Museum. Construction of Belfast, the first ship in the Royal Navy to be named after the capital of Northern Ireland and one of 10 Town-class cruisers, began in December 1936. She was launched on Saint Patrick's Day 1938. Commissioned in early August 1939, shortly before the outbreak of the Second World War, Belfast was initially part of the British naval blockade against Germany. In November 1939, Belfast triggered a German mine, and in spite of fears that she would be scrapped, she spent more than two years undergoing extensive repairs.
Belfast returned to action in November 1942 with improved firepower, radar equipment, and armour. She saw action escorting Arctic convoys to the Soviet Union during 1943 and in December 1943 played an important role in the Battle of North Cape, assisting in the destruction of the German warship . In June 1944, Belfast took part in Operation Overlord supporting the Normandy landings. In June 1945, she was redeployed to the Far East to join the British Pacific Fleet, arriving shortly before the end of the Second World War. Belfast saw further combat action in during the Korean War and underwent an extensive modernisation between 1956 and 1959. A number of further overseas commissions followed before she entered reserve in 1963.
In 1967, efforts were initiated to avert Belfast expected scrapping and to preserve her as a museum ship. A joint committee of the Imperial War Museum, the National Maritime Museum, and the Ministry of Defence was established and then reported in June 1968 that preservation was practical. In 1971, however, the government decided against preservation, prompting the formation of the private HMS Belfast Trust to campaign for her preservation. The efforts of the Trust were successful, and the government transferred the ship to the trust in July 1971. Brought to London, she was moored on the River Thames near Tower Bridge in the Pool of London. Opened to the public in October 1971, Belfast became a branch of the Imperial War Museum in 1978. Since 1973, she has been home to the City of London Sea Cadets, who meet on board twice a week. A popular tourist attraction, Belfast received 204,656 visitors in 2025. As a branch of a national museum and part of the National Historic Fleet, Belfast is supported by the Department for Culture, Media and Sport, admissions income, and the museum's commercial activities.
Design
Belfast is a cruiser of the third Town class (named after towns, with no ship of that name). The Town class had originated in 1933 as the British Admiralty's response to the Imperial Japanese Navy's , an -ton cruiser mounting fifteen guns with a top speed exceeding . The Admiralty's requirement called for a 9,000-ton cruiser, sufficiently armoured to withstand a direct hit from an shell, capable of , and mounting twelve 6-inch guns. Seaplanes carried aboard would enable shipping lanes to be patrolled over a wide area and the class was also to be capable of its own antiaircraft (AA) defence. Under the Director of Naval Construction, the new design evolved during 1933. The lead ship of the new class, the 9,100-ton and her sister were ordered under the 1933 estimates. Three more cruisers were built to this design, with a further three ships built to a slightly larger, 9,400-ton design in 1935–36. By 1935, however, the Admiralty was keen to improve the firepower of these cruisers to match the firepower of the Japanese Mogami-class and American s; both were armed with fifteen 6-inch guns. The Admiralty rejected a design featuring five triple turrets as impractical, while an alternative design fitting four quadruple turrets was rejected, as an effective quadruple turret could not be developed. In May 1936, the Admiralty decided to fit triple turrets, whose improved design would permit an increase in deck armour. This modified design became the 10,000-ton Edinburgh subclass, named after Belfasts sister ship . Belfast was ordered from Harland and Wolff on 21 September 1936, and her keel laid on 10 December 1936. Her expected cost was £2,141,514, of which the guns cost £75,000 and the aircraft (two Supermarine Walruses) £66,500. She was launched on Saint Patrick's Day, 17 March 1938, by Anne Chamberlain, the wife of Prime Minister Neville Chamberlain. The launch was filmed by Pathé News. From March to August 1939, Belfast was fitted out and underwent sea trials.
When completed, Belfast had an overall length of , a beam of , and a draught of . Her standard displacement during her sea trials was . She was propelled by four three-drum, oil-fired Admiralty water-tube boilers, turning Parsons-geared steam turbines, driving four propeller shafts. She was capable of and carried of fuel oil. This gave her a maximum range of at .
Belfasts main armament comprised 12 Mk XXIII 6-inch guns in four triple turrets directed by an Admiralty Fire Control Table. With a rate of fire of up to eight rounds per gun per minute, her main battery was capable of a total maximum rate of fire of 96 rounds per minute. Her secondary armament comprised twelve 4-inch guns in six twin mounts. Her initial close-range AA armament was sixteen 2-pounder "pom-pom" guns in two eight-barrel mountings and two quadruple Vickers .50 machine guns. She also mounted six Mk IV 21-inch torpedo tubes in two triple mounts and 15 Mk VII depth charges.
Belfast was protected by a main armour belt, with deck armour of over her magazines and over her machinery spaces. Her six-inch turrets were protected by up to of armour.
Belfasts aviation capability was provided by two catapult-launched Supermarine Walrus amphibious biplanes. These could be launched from a D1H catapult mounted aft of the forward superstructure and recoverable from the water by two cranes mounted on either side of the forward funnel. The aircraft, operated by the Fleet Air Arm's HMS Belfast Flight of 700 Naval Air Squadron, were stowed in two hangars in the forward superstructure.
Second World War
1939–1942: commissioning, prize capture, mining and repairs Belfast departed for Portsmouth on 3 August 1939 and was commissioned on 5 August 1939, less than a month before the outbreak of World War II. Her first captain was Captain G.A. Scott with a crew of 761, and her first assignment was to the Home Fleet's 2nd Cruiser Squadron. On 14 August, Belfast took part in her first exercise, Operation Hipper, in which she played the role of a German commerce raider attempting to escape into the Atlantic. By navigating the hazardous Pentland Firth, Belfast successfully evaded the Home Fleet.
On 31 August 1939 Belfast was transferred to the 18th Cruiser Squadron. Based at Scapa Flow in the Orkney Islands, 18th Cruiser Squadron was part of the British effort to impose a naval blockade on Germany, which invaded Poland the following day; Britain and France declared war on 3 September. At 11:40 that morning, Belfast received the message "Commence hostilities at once against Germany". On 8 September, Belfast put to sea from Scapa Flow with the battlecruisers and , her sister ship Edinburgh, and four destroyers, on a patrol intended to intercept German ships returning from Norway. In particular, they were to search for the Norddeutscher Lloyd liner , which had left New York (without passengers) on 30 August 1939. The Royal Navy were unaware that the liner had already docked safely in Murmansk on 6 September. No enemy vessels were found. On 25 September, Belfast took part in a fleet operation to recover the submarine , during which the ship was attacked by German aircraft, but suffered no damage. On 1 October 1939, Belfast left Scapa Flow for a patrol in the North Sea. On 5 October, she intercepted and boarded a neutral Norwegian factory ship that was sailing in company with six whaling ships. On 8 October, the ship sighted the Swedish merchant ship C. P. Lilljevach, but in poor weather, did not intercept or board her. The following day, she boarded Tai Yin, a Norwegian ship. Tai Yin had been listed by the Admiralty as suspicious, so a prize crew from Belfast sailed her to Kirkwall for investigation. On 9 October, Belfast intercepted a German liner, the 13,615-ton Cap Norte, north-west of the Faroe Islands. Disguised as neutral Swedish vessel SS Ancona, Cap Norte was attempting to return to Germany from Brazil; her passengers included German reservists. Under the Admiralty's prize rules, Belfasts crew later received prize money. On 12 October, Belfast boarded the Swedish ship Uddeholm, which was also sailed to Kirkwall by a prize crew. Returning to harbour on the night of 13–14 October, Belfast was among the few ships anchored in Scapa Flow, following intelligence reports of an expected air raid. That night, the battleship was torpedoed by German submarine , which had infiltrated the anchorage. On the morning following the sinking, Belfast left for Loch Ewe.
On 10 November, Belfast was taken off the northern patrol and reassigned to the 2nd Cruiser Squadron, which was to form an independent striking force based at Rosyth. On 21 November, Belfast was to take part in the force's first sortie, a gunnery exercise. At 10:58 am, she detonated a magnetic mine while leaving the Firth of Forth. The mine broke Belfasts keel and wrecked one of her engine and boiler rooms. Twenty officers and men required hospital treatment for injuries caused by the explosion, and a further 26 suffered minor injuries. One man, Painter 2nd Class Henry Stanton, was hospitalised and later died of a head injury, having been thrown against the deckhead by the blast. The tugboat Krooman, towing gunnery targets for the exercise, released her targets and instead towed Belfast to Rosyth for initial repairs.
Initial assessments of Belfasts damage showed that while the mine had done little direct damage to the outer hull, causing only a small hole directly below one of the boiler rooms, the shock of the explosion had caused severe warping, thus breaking machinery, deforming the decks, and causing the keel to hog (bend upwards) by three inches. On 4 January 1940, Belfast was decommissioned to care and maintenance status, becoming the responsibility of Rosyth Dockyard, and her crew dispersed to other vessels. By 28 June, she had been repaired sufficiently to sail to Devonport, arriving on 30 June under the command of Lt Cdr H W Parkinson.
During her repairs, work was carried out to straighten, reconstruct, and strengthen her hull. Her armour belt was also extended and thickened. Her armament was updated with newer 2-pounder pom-pom mountings and her AA armament improved with eighteen 20 mm Oerlikon guns in five twin and eight single mountings, replacing two quadruple 0.5-inch Vickers guns. Belfast also received new fire-control radars for her main, secondary, and AA guns. Her November 1942 radar fit included one Type 284 set and four Type 283 sets to direct the main armament, three Type 285 sets for the secondary guns, and two Type 282 sets for the 2-pounder AA guns. She also received a Type 273 general surface-warning radar, Type 251 and 252 sets for identification friend or foe purposes and a Type 281 and Type 242 for air warning. Her 1942 electronics suite also included a Type 270 echosounder. Due to her increased topweight, a bulge was introduced into her hull amidships to improve stability and provide extra longitudinal strength. Her beam had increased to and her draught to forward and aft.
1942–1943: recommissioning, Arctic convoys, and Battle of North Cape