The 1942 Design Light Fleet Carrier, commonly referred to as the British Light Fleet Carrier, was a light aircraft carrier design created by the Royal Navy during the Second World War, and used by eight naval forces between 1944 and 2001. They were designed and constructed by civilian shipyards to serve as an intermediate step between the expensive, full-size fleet aircraft carriers and the less expensive but limited-capability escort carriers.

Sixteen Light Fleet carriers were ordered, and all were laid down to the Colossus class design during 1942 and 1943. However, only eight were completed to this design; of these, four entered service before the end of the war, and none saw front line operations. Two more were fitted with maintenance and repair facilities instead of aircraft catapults and arresting gear, and entered service as aircraft maintenance carriers. The final six were modified during construction to handle larger and faster aircraft, and were redesignated the Majestic class. The construction of the six ships was suspended at the end of the war. Five were eventually completed with the last commissioning in 1961; however, the sixth, Leviathan, was dismantled for spare parts and scrap.

Although not completed in time to fight in the war, the carriers in Royal Navy service participated in the Korean War and the Suez Crisis. During the latter, two Colossus-class ships performed the first ship-based helicopter assault in history. Four Colossuses and all five completed Majestics were loaned or sold to seven foreign nations – Argentina, Australia, Brazil, Canada, France, India, and the Netherlands – with three ships serving in three different naval forces during their careers. Foreign-operated Light Fleets took part in the Korean War, the First Indochina War, the Vietnam War, the 1971 Indo-Pakistani War, and the Falklands War.