HMS Argonaut was a Dido-class cruiser of the British Royal Navy which saw active service during the Second World War. Constructed at the Cammell Laird shipyard, Birkenhead, Argonaut was laid down in 1939, launched in September 1941, and formally commissioned into service on 8 August 1942. She saw service in the Mediterranean in 1942, and was badly damaged on 14 December. After being repaired she took part in Operation Overlord, the Normandy Landings, and Operation Dragoon, the invasion of Southern France, before serving as an escort carrier group flagship. After the war she was laid up and scrapped in 1955.