The 1966 United States Senate election in Texas was held on November 8, 1966. Incumbent Republican U.S. Senator John Tower was re-elected to a second term in office over Democratic Attorney General of Texas Waggoner Carr.
Tower: 50–60% 60–70% 70–80%
Carr: 50–60% 60–70% 70–80% 80–90% 90–100%
|Democratic||John R. Willoughby||226,598||20.12%|
- John G. Tower, incumbent U.S. Senator since 1961
|Republican||John Tower (Incumbent)||841,501||56.39%|
|Constitution||James Baker Holland||6,778||0.45%|
- "US Senate - D Primary". OurCampaigns.com. Retrieved June 17, 2020.
- "Our Campaigns - TX US Senate Race - Nov 08, 1966".