HMS Pandora was a British Parthian-class submarine commissioned in 1930 and lost in 1942 during the Second World War.

On 4 July 1940 she torpedoed and sank the French aviso Rigault de Genouilly off the Algerian coast.

In an extension of the Lend-Lease program, Pandora, along with three other British and French submarines, was overhauled at Portsmouth Naval Shipyard in the United States.

The class had a design flaw in that the riveted external fuel tanks leaked, leaving an oil trail on the surface.

[6] In 1940, Pandora became part of the First Submarine Flotilla along with Parthian, Phoenix, Proteus, Grampus, Rorqual, Odin, Orpheus, Olympus, Otus, Otway, Osiris, and the depot ship Medway.

A bombing raid took place on 1 April 1942 while she was unloading, but the decision was made to continue the process to save time.