Haskell: 40–50% 50–60% 60–70%
Allott: 40–50% 50–60% 60–70%
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.
- Floyd Haskell, former Republican State Representative from Littleton
- Anthony Vollack, State Senator from Arvada
Floyd Haskell, a former State Representative who had served as a Republican from 1965–67, but had left the party in 1970 over opposition to the Vietnam War, won the primary.
|Republican||Gordon Allott (incumbent)||447,957||48.37%||9.65|
|Raza Unida||Secundino Salazar||13,228||1.43%||N/A|
|American||Henry John Olshaw||7,353||0.79%||N/A|
|Democratic gain from Republican|