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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 as of 2020, the sole inhabited island of the Phoenix Islands, in the Republic of Kiribati. It is an atoll located in the South Pacific Ocean roughly halfway between Hawaii and Fiji. The island is a narrow ribbon of land around a lagoon; an area of 40 square kilometers. Kanton's closest neighbour is the uninhabited Enderbury Island, 63 km (39 mi) west-southwest. The capital of Kiribati, South Tarawa, lies 1,765 km (1,097 mi) to the west. As of 2015, the population was 20, down from 61 in 2000. The island's sole village is called Tebaronga.

Kiribati declared the Phoenix Islands Protected Area in 2006, with the park being expanded in 2008. The 425,300 km2 (164,200 sq mi) marine reserve contains eight coral atolls, including Kanton. Because it is inhabited, management of Kanton Island is described in the Kanton Resource Use Sustainability Plan (KRUSP), which covers a 12 nmi (22 km; 14 mi) radius around the atoll. Over 50% of the island and lagoon are protected in a conservation zone.