Three, and possibly four, vessels of the Royal Navy have borne the name HMS Placentia, after locations in Newfoundland, including Placentia Bay and the town of Placentia:

• HMS Placentia (1775) was a 6-gun schooner purchased in 1775 and wrecked, with the loss of two lives, on 14 September 1775.^[1]
• A cutter HMS Placentia apparently served between 1777 and 1779.^[2]
• HMS Placentia (1779) was a 14-gun sloop, purchased in 1780 and wrecked on 10 September 1782 on Newfoundland with no survivors.^[3] Earlier that year Lieutenant Charles Anderson had captured two American schooners, Lord Sterling and Penguin, each of eight guns.^[4]
• HMS Placentia (1789) was a minimally armed sloop launched in 1789, name vessel of her two-vessel class, that her crew abandoned in a sinking state on 8 May 1794 off Marticot Island, Newfoundland.^[5]