Gosnold is a town in Dukes County, Massachusetts, United States. At the 2020 census, the town population was 70, making it the least populous town in Massachusetts. Gosnold encompasses the Elizabeth Islands and most residents live in the island-village of Cuttyhunk. Most of Gosnold is privately owned by the Forbes family, except for the islands of Cuttyhunk and Penikese.

The earliest inhabitants of the Elizabeth Islands were the Wampanoag Native Americans. The tribe did not settle permanently on the Elizabeth Islands, but used them in summer for hunting, fishing, and gardening. Occasionally, arrowheads or stone tools are discovered on the islands. The islands' names come from the Wampanoag language.

Bartholomew Gosnold was among the first Europeans to become aware of the Elizabeth Islands, including Cuttyhunk, in 1602. He and his crew attempted to establish a trading post on Cuttyhunk so that they could trade with the natives, the first attempt by Europeans to do so. The trading post was abandoned after only a few weeks, and Gosnold decided to return home. Upon his return to England, the British Crown claimed jurisdiction of the island chain.

Gosnold was first settled in 1641, the year of purchase of the islands by Thomas Mayhew, Sr. The islands were claimed by the Wampanoag until 1658, when the Wampanoag sachem transferred^{[clarification needed]} the deed of ownership to Mayhew. Constituting Dukes County, New York since 1683, the Elizabeth Islands, Martha's Vineyard, and Nantucket, were transferred to the newly created Province of Massachusetts Bay in 1691. Gosnold was separately incorporated as a municipality in 1864; previously it was a part of the town of Chilmark.

According to the United States Census Bureau, the town has a total area of 140.2 square miles (363.0 km²), of which 13.2 square miles (34.2 km²) is land and 127.0 square miles (328.9 km²), or 90.59%, is water. Gosnold ranks 272nd out of the 351 communities in the Commonwealth in terms of land area; however, it has the longest distance between points within municipal limits of any town in the Commonwealth of Massachusetts. It consists of the Elizabeth Islands, including Nonamesset Island, Uncatena Island, Naushon Island, Pasque Island, Nashawena Island, Penikese Island, Cuttyhunk Island, and several smaller islands. The string of islands extend roughly southwest of the southwestern tip of Falmouth, with the closest island, Nonamesset, being less than one-third of a mile away at its closest point. More than half the population lives on Cuttyhunk, with the majority of the rest living on Naushon.

Transportation to the island of Cuttyhunk is served by Cuttyhunk Ferry Company from New Bedford. Service is daily in the warm months, and on Monday and Friday in the cooler months. There is also a water taxi service between New Bedford and Cuttyhunk.

Naushon Island is served by a private ferry from Woods Hole. The islands of Nonamesset and Uncatena are connected to Naushon Island via bridges that can be crossed by foot.

Penikese Island is accessible via a chartered boat for STEM-related school trips.