The 1966 Massachusetts gubernatorial election was held on November 8, 1966. Governor John A. Volpe was reelected to a four-year term. He defeated former Attorney General Edward J. McCormack Jr. in the general election. This was the first election held since the governor's term of office was extended from two to four years.
Republican primary
Candidates
- John Volpe, incumbent governor
Results
Governor Volpe was unopposed for renomination.
Democratic primary
Candidates
- Edward J. McCormack Jr., former Massachusetts attorney general
- Kenneth O'Donnell, former aide to President Kennedy
General election
Results
Volpe defeated McCormack by over a half million votes. He won the majority of the votes in every Massachusetts county. This was the last general election in which the governor and lieutenant governor were elected separately.
Results by county
Counties that flipped from Democratic to Republican
- Bristol
- Essex
- Hampden
- Suffolk
- Worcester