St Mary's Island

St Mary's Island may refer to:

Places

 * England
 * St Mary's Island, Kent, in Medway
 * St Mary's Island, River Thames, in the county of Berkshire
 * St Mary's Island (Tyne and Wear), in the metropolitan county of Tyne and Wear
 * St Mary's, Isles of Scilly, in the county of Cornwall


 * India
 * St. Mary's Islands, in the state of Karnataka


 * Isle of Man
 * St Mary's Isle, Douglas Bay


 * Madagascar
 * Île Sainte-Marie, also known as St Mary's Island in English, in the region of Analanjirofo


 * The Gambia
 * Another name for Banjul Island, in Banjul division