| Election Name: | 1990 United States Senate election in Colorado |
| Country: | Colorado |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1984 United States Senate election in Colorado |
| Previous Year: | 1984 |
| Next Election: | 1996 United States Senate election in Colorado |
| Next Year: | 1996 |
| Election Date: | November 6, 1990 |
| Nominee1: | Hank Brown |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 569,048 |
| Percentage1: | 55.68% |
| Nominee2: | Josie Heath |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 425,746 |
| Percentage2: | 41.66% |
| U.S. Senator | |
| Before Election: | William L. Armstrong |
| Before Party: | Republican Party (United States) |
| After Election: | Hank Brown |
| After Party: | Republican Party (United States) |
| Map Size: | 250px |
The 1990 United States Senate election in Colorado took place on November 6, 1990. Incumbent Republican senator William L. Armstrong did not seek re-election to another term. Republican nominee Hank Brown won the open seat, defeating Democratic nominee Josie Heath.