| Election Name: | 1990 United States Senate election in Montana |
| Country: | Montana |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1984 United States Senate election in Montana |
| Previous Year: | 1984 |
| Next Election: | 1996 United States Senate election in Montana |
| Next Year: | 1996 |
| Election Date: | November 6, 1990 |
| Image1: | MaxBaucus (1).jpg |
| Nominee1: | Max Baucus |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 217,563 |
| Percentage1: | 68.1% |
| Nominee2: | Allen Kolstad |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 93,836 |
| Percentage2: | 29.4% |
| U.S. Senator | |
| Before Election: | Max Baucus |
| Before Party: | Democratic Party (United States) |
| After Election: | Max Baucus |
| After Party: | Democratic Party (United States) |
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.