Massachusetts's 8th congressional district is located in eastern Massachusetts, including part of Boston.

It is represented by Democrat Stephen Lynch.

[3] The new 8th district comprises many of the communities of the old 9th district, as well as some easternmost Norfolk County communities and northernmost Plymouth County communities of the old 10th district.

This district has the distinction of being the only one ever represented by someone who had previously served as president of the United States, as John Quincy Adams held this office after leaving the presidency from 1843 until his death in 1848.

For the 118th and successive Congresses (based on redistricting following the 2020 census), the district contains all or portions of four counties and 21 municipalities:[5] Bristol County (1) Norfolk County (12) Plymouth County (7) Suffolk County (1) In Norfolk County: Avon, Braintree, Canton, Cohasset, Dedham, Holbrook, Milton:Precincts 2–4, and 6–9, Norwood, Quincy, Randolph, Stoughton, Walpole, Westwood, and Weymouth.