Of the 9 Massachusetts incumbents, 6 were re-elected.
|Massachusetts 1||Silvio Conte||Republican||1958||Incumbent re-elected.||? Silvio Conte (Republican) Unopposed|
|Massachusetts 2||Edward Boland||Democratic||1952||Incumbent re-elected.||? Edward Boland (Democratic) Unopposed|
|Massachusetts 3||Harold Donohue
Redistricted from the 4th district
|Democratic||1946||Incumbent re-elected.||? Harold Donohue (Democratic) Unopposed|
|Massachusetts 4||Robert Drinan
Redistricted from the 3rd district
|Democratic||1970||Incumbent re-elected.||? Robert Drinan (Democratic) 68.9%|
Martin A. Linsky (Republican) 23.4%
John Collins (Ind Con) 7.7%
|Massachusetts 5||Frank B. Morse||Republican||1960||Resigned when appointed to United Nations
|? Paul W. Cronin (Republican) 53.4%|
John Kerry (Democratic) 44.7%
Roger Durkin (Independent) 1.8%
|Massachusetts 6||Michael J. Harrington||Democratic||1969||Incumbent re-elected.||? Michael J. Harrington (Democratic) 64.1%|
James Brady Moseley (Republican) 35.9%
|Massachusetts 7||Torbert H. MacDonald||Democratic||1954||Incumbent re-elected.||? Torbert H. MacDonald (Democratic) 67.7%|
Joan M. Aliberti (Republican) 32.3%
|Massachusetts 8||Tip O'Neill||Democratic||1952||Incumbent re-elected.||? Tip O'Neill (Democratic) 88.7%|
John Powers (Socialist Workers) 11.3%
|Massachusetts 9||Louise Day Hicks||Democratic||1970||Incumbent lost re-election.
New member elected.
Challenger joined Democratic caucus
|? Joe Moakley (Ind Con) 43.2%|
Louise Day Hicks (Democratic) 41.1%
Howard M. Miller (Republican) 14.2%
Jeanne Lafferty (Independent) 1.5%
|Massachusetts 10||Margaret Heckler||Republican||1966||Incumbent re-elected.||? Margaret Heckler (Republican) Unopposed|
|Massachusetts 11||James A. Burke||Democratic||1958||Incumbent re-elected.||? James A. Burke (Democratic) Unopposed|
|Massachusetts 12||Hastings Keith||Republican||1958||Incumbent retired.
New member elected.
|? Gerry E. Studds (Democratic) 50.3%|
William D. Weeks (Republican) 49.7%