Three vessels of the Royal Navy have been named HMS Leocadia:
HMS Leocadia (1781) was the Spanish 34-gun frigateSanta Leocadia, captured by HMS Canada in 1781 and taken into service as a 36-gun frigate. She was sold in 1794.
HMS Leocadia (1804) was the Spanish 36-gun frigate Santa Clara captured at the action of 5 October 1804. She was initially renamed Leocadia before being commissioned as Clara. Sold in 1815.