St Mary's Island may refer to:
Places
;England
*
St Mary's Island, Kent
St Mary's Island, is part of the Chatham Maritime development area in Medway, South East England. It is located at the northern end of Chatham, adjacent to Brompton and Gillingham. Once part of the Royal Dockyard, Chatham, the area had cons ...
, in Medway
*
St Mary's Island, River Thames
St Mary's Island is a tiny island in the River Thames in England. It has a size of about 150 m by 50 m.
St Mary's Island (Tyne and Wear)
St Mary's Island, sometimes referred to as Bait Island is a small sandstone island near the seaside resort of Whitley Bay, Tyne and Wear, England. It is a Local Nature Reserve.
St Mary's Island was originally called Bates Island, Hartley Bate ...
, 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
St Mary's Isle (also known as Conister Rock or the Tower of Refuge, Manx language, Manx: or ''Creg Voirrey'') is a partially submerged reef in Douglas, Isle of Man, Douglas Bay on the Isle of Man. Prior to 1832 the rock was the property of the ...
, Douglas Bay
;Madagascar
*
ÃŽle Sainte-Marie, also known as St Mary's Island in English, in the region of Analanjirofo
;The Gambia
* Another name for
Island, in Banjul division
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