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Allott: 50–60% 60–70% 70–80%
Romer: 50–60% 60–70%
The 1966 United States Senate election in Colorado took place on November 8, 1966. Incumbent Republican Senator Gordon Allott was re-elected to a third term in office, defeating Democratic State Senator Roy Romer.
Romer would later be elected three terms as Treasurer of Colorado and another three terms as Governor.
|Republican||Gordon Allott (Incumbent)||368,307||58.02%||4.50|
|Independent||Walter Cranson (write-in)||332||0.05%||N/A|