Baucus: 50–60% 60–70% 70–80% 80–90%
The 1990 United States Senate election in Montana took place on November 6, 1990. Incumbent United States Senator Max Baucus, who was first elected in 1978 and was re-elected in 1984, ran for re-election. After winning the Democratic primary, he moved on to the general election, where he was opposed by Allen Kolstad, the Lieutenant Governor of Montana and the Republican nominee. Baucus ultimately ended up defeating Kolstad in a landslide, winning his third term with ease.
- Max Baucus, incumbent United States Senator
- John Driscoll, former Speaker of the Montana House of Representatives
- "Curly" Thornton
|Democratic||Max Baucus (incumbent)||80,622||82.60%|
- Allen Kolstad, Lieutenant Governor of Montana
- Bruce Vorhauer, businessman
- Bill Farrell
- John Domenech
|Democratic||Max Baucus (incumbent)||217,563||68.13%||+11.24%|
|Libertarian||Westley F. Deitchler||7,937||2.49%||+0.07%|
- "Report of the Official Canvass of the Vote Cast at the Primary Election Held in the State of Montana, June 5, 1990" (PDF). Montana Secretary of State. Archived from the original (PDF) on December 28, 2013. Retrieved July 2, 2014.
- "Statistics of the Congressional Election of November 6, 1990" (PDF). Clerk of the United States House of Representatives. Retrieved July 2, 2014.