St Mary's Island

St Mary's Island may refer to:

Places

England

• St Mary's Island, Medway, in the county of Kent
• 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

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