HMS Britannia was a 120-gun first-rate ship-of-the-line of the Royal Navy, laid down in 1813 and launched on 20 October 1820.

She was decommissioned in 1843,[citation needed] before returning to service for the Crimean War, serving as flagship of Admiral Sir James Deans Dundas,[2] commanding the British fleet in the Mediterranean and Black Sea from 1851–4.

[3] On 14 November 1854, she was driven ashore on the Russian coast and was reported to have 5 feet (1.5 m) of water in her hold.

[1] Her place at Dartmouth was taken by HMS Prince of Wales, which was renamed Britannia for the role.

Generations of naval officers had their first taste of the navy aboard the two Britannias.