HMS Mary Galley was a 44-gun fifth rate frigate of the Royal Navy, built in 1744 for service in the War of the Austrian Succession against France, Prussia and Spain.

After two years assigned to patrol duties in the English Channel she was sent to the Caribbean to protect British commercial interests from pirate attacks.

At the conclusion of the War she was returned to England in need of repair, but was instead left docked at Plymouth until 1764 when she was sunk as part of a breakwater for the port.

[3][1] Under Swanton, Mary Galley undertook an extensive voyage of patrol along the Bristol Channel, the Downs and into the North Sea.

[1] The ship returned to sea in April 1746 and was assigned to Atlantic service off west Africa, and then to the Leeward Islands from 1747 to 1748.