| Election Name: | 1972 United States Senate election in Colorado |
| Country: | Colorado |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1966 United States Senate election in Colorado |
| Previous Year: | 1966 |
| Next Election: | 1978 United States Senate election in Colorado |
| Next Year: | 1978 |
| Election Date: | November 7, 1972 |
| Image1: | FloydHaskell.jpg |
| Nominee1: | Floyd Haskell |
| Party1: | Democratic Party (US) |
| Popular Vote1: | 457,545 |
| Percentage1: | 49.41% |
| Party2: | Republican Party (US) |
| Popular Vote2: | 447,957 |
| Percentage2: | 48.37% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Party: | Republican Party (US) |
| After Party: | Democratic Party (US) |
The 1972 United States Senate election in Colorado took place on November 7, 1972. Incumbent Republican U.S. Senator Gordon Allott ran for re-election to a fourth term, but was narrowly defeated by Democratic former State Representative Floyd Haskell. This would be the last time until 2008 that a Democrat was elected to the Class 2 Senate seat from Colorado. Colorado was one of fifteen states alongside Alabama, Arkansas, Delaware, Georgia, Iowa, Louisiana, Maine, Minnesota, Mississippi, Montana, New Hampshire, Rhode Island, South Dakota and West Virginia that were won by Republican president Richard Nixon in 1972 that elected Democrats to the United States Senate.
Floyd Haskell, a former State Representative who had served as a Republican from 1965 to 1967, but had left the party in 1970 over opposition to the Vietnam War, won the primary.