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 became the first Republican ever reelected to the Senate from Texas or any former Confederate state.

1966 United States Senate election in Texas

← 1961 (special) November 8, 1966 1972 →

Nominee John Tower Waggoner Carr Party Republican Democratic Popular vote 842,501 643,855 Percentage 56.42% 43.12%

County results Tower:      50–60%      60–70%      70–80% Carr:      50–60%      60–70%      70–80%      80–90%      >90% Tie      40–50%

U.S. senator before election John Tower Republican Elected U.S. Senator John Tower Republican