HMS San Josef was a 114-gun first-rate ship of the line of the Royal Navy. Originally built at Ferrol in Galicia for the Spanish Navy in 1782–83, she was captured from the Spanish Navy at the Battle of Cape St Vincent on 14 February 1797. In 1809 she served as the flagship of Admiral John Thomas Duckworth.

The Battle of Cape St. Vincent was one of the opening battles of the Anglo-Spanish War (1796–1808), as part of the French Revolutionary Wars, where a British fleet under Admiral Sir John Jervis defeated a greatly superior Spanish fleet under Admiral Don José de Córdoba y Ramos near Cape St. Vincent, Portugal.