HMS Princess Mary

Three ships of the Royal Navy have borne the name HMS Princess Mary or HMS Princess Maria:


 * HMS Princess Maria was a 38-gun ship captured in 1652 and wrecked in 1658.
 * HMS Princess Mary was a yacht built in 1688. She was sold at some point, becoming a merchant ship.  She remained in service until 1827 under the name Betty Cairns.
 * HMS Princess Mary was a 60-gun fourth rate launched in 1704 as HMS Mary. She was relaunched in 1742 as HMS Princess Mary, and was sold in 1766.