Baucus: 40–50% 50–60% 60–70% 70–80%
Cozzens: 40–50% 50–60%
The 1984 United States Senate election in Montana took place on November 6, 1984. Incumbent United States Senator Max Baucus, who was first elected in 1978, ran for re-election. He easily won renomination in the Democratic primary, and advanced to the general election, where he faced Chuck Cozzens, a former State Representative and the Republican nominee. Despite President Ronald Reagan's strong performance in the state that year, Baucus was able to easily win a second term over Cozzens.
- Max Baucus, incumbent Senator
- Bob Ripley
|Democratic||Max Baucus (incumbent)||80,726||79.37%|
- Chuck Cozzens, former State Representative
- Ralph Bouma, retired farmer
- Aubyn Curtiss, State Representative
|Democratic||Max Baucus (incumbent)||215,704||56.89%||+1.20%|
- "Report of the Official Canvass of the Vote Cast at the Primary Election Held in the State of Montana, June 5, 1984" (PDF). Montana Secretary of State. Archived from the original (PDF) on 2013-06-15. Retrieved July 2, 2014.
- Clerk of the United States House of Representatives (1985). "Statistics of the Presidential and Congressional Election of November 6, 1984" (PDF). U.S. Government Printing Office.