Mary Island may refer to:
- Mary Island (Nunavut) in the Canadian Arctic 63°23′N 67°37′W / 63.38°N 67.61°W
- Kanton Island, Kiribati 02°48′38″S 171°40′32″W / 2.81056°S 171.67556°W
- Mary Island (Western Australia) 13°59′49″S 126°22′47″E / 13.99694°S 126.37972°E
This disambiguation page lists articles about distinct geographical locations with the same name.
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