Nantucket County is a county located in the U.S. state of Massachusetts. Its county seat is Nantucket. It is located in the state's southeastern region, approximately 30 miles (48 km) south of Cape Cod.

The county government consists of a Board of County Commissioners, which is the legislative body of the county. The Board is composed of three members, each elected to a three-year term. The Board is responsible for setting policy and enacting laws and regulations. The County Administrator is responsible for the day-to-day operations of the county government.

Nantucket County is part of the Barnstable-Nantucket-Dukes County Regional Government, which provides services to the three counties. The county is also part of the Cape Cod Commission, which is responsible for regional planning and economic development.

Nantucket County is home to the Nantucket National Wildlife Refuge, which is managed by the U.S. Fish and Wildlife Service. The refuge is located on the island of Nantucket and is home to a variety of wildlife, including seals, sea turtles, and migratory birds.

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