Nonamesset Island is the most easterly of the Elizabeth Islands of Dukes County, Massachusetts, United States.

The island has a land area of 1.398 km2 (0.540 sq mi) or 345.5 acres) and was uninhabited as of the 2000 census.

[2] The island is part of the town of Gosnold, Massachusetts.

Painter Robert Swain Gifford was born on the island in 1840.

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