The Avenger-class escort carrier was a class of escort carriers comprising three ships in service with the Royal Navy during the Second World War and one ship of the class in the United States Navy called the Charger Type of 1942-class escort carrier. All three were originally American type C3 merchant ships in the process of being built at the Sun Shipbuilding and Drydock Company Chester, Pennsylvania. The ships laid down in 1939 and 1940 were launched and delivered to the Royal Navy by 1942 under the Lend-Lease agreement.
The ships had a complement of 555 men and an overall length of , a beam of and a height of .
Aircraft facilities were a small combined bridge–flight control on the starboard side and above the long wooden flight deck, one aircraft lift , one aircraft catapult and nine arrestor wires. Aircraft could be housed in the half hangar below the flight deck. Armament comprised three single mounted 4-inch dual purpose anti-aircraft guns and fifteen 20 mm cannons on single or twin mounts.