HMS Dasher (D37) was a British Royal Navy aircraft carrier, of the Avenger class, converted merchant vessels, and one of the shortest-lived escort carriers. She served in the Second World War and sank on 27 March 1943.

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.