Fairhaven is a town in Bristol County, Massachusetts, United States. It is located on the south coast of Massachusetts where the Acushnet River flows into Buzzards Bay, an arm of the Atlantic Ocean. The town shares a harbor with the city of New Bedford, a place well known for its whaling and fishing heritage; consequently, Fairhaven's history, economy, and culture are closely aligned with those of its larger neighbor. The population of Fairhaven was 15,873 at the time of the 2010 census.

Fairhaven was first settled in 1659 as "Cushnea", the easternmost part of the town of Dartmouth. It was founded on land purchased by English settlers at the Plymouth Colony from the Wampanoag sachem Massasoit, and his son, Wamsutta.

In 1787, the eastern portion of Dartmouth seceded and formed a new settlement called New Bedford. This new town included areas that are the present-day towns of Fairhaven, Acushnet, and New Bedford itself. Fairhaven eventually separated from New Bedford, and it was officially incorporated in 1812. At that time, Fairhaven included all of the land on the east bank of the Acushnet River. The northern portion of Fairhaven, upriver from Buzzards Bay, formed another independent town, called Acushnet, in 1860. Thus, what had once been a single town, Dartmouth, with a substantial land area, became, in less than 75 years, four separate municipalities. (The western portion of the original Dartmouth land-purchase eventually became a fifth town, Westport.)

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