Mary Island may refer to:
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Mary Island (Nunavut) in the Canadian Arctic
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Kanton Island
Canton Island (also known as Kanton or Abariringa), previously known as Mary Island, Mary Balcout's Island or Swallow Island, is the largest, northernmost, and , the sole inhabited island of the Phoenix Islands, in the Republic of Kiribati. It i ...
, Kiribati
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Mary Island (Western Australia)
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