Braintree (US: ), officially the Town of Braintree, is a municipality in Norfolk County, Massachusetts, United States. Although officially known as a town, Braintree is a city, with a mayor-council form of government, and is considered a city under Massachusetts law. The population was 35,744 at the 2010 census. The city is part of the Greater Boston area with access to the MBTA Red Line, and is a member of the Metropolitan Area Planning Council's South Shore Coalition. The first mayor of Braintree was Joe Sullivan who served until January 2020. The current mayor of Braintree is Charles Kokoros.
Braintree, Massachusetts, is named after Braintree, Essex, in England. The town was first chartered in 1640. Later, some sections of Braintree formed separate municipalities: Quincy (1792), Randolph (1793), and Holbrook (1872).
Various Native American tribes inhabited the area prior to the arrival of European settlers in 1625. Subsequent to their arrival, the town was colonized in 1635, and ultimately incorporated in 1640.