The 1974 United States Senate election in Louisiana was held on November 5, 1974. Incumbent Democratic Senator Russell Long was elected to a sixth term in office.

1974 Democratic Senate primary election in Louisiana

← 1968 August 17, 1974 1980 →

Nominee Russell B. Long Sherman A. Bernard Annie Smart Party Democratic Democratic Democratic Popular vote 520,606 131,540 44,341 Percentage 74.75% 18.89% 6.37%

Parish results Long:      50–60%      60–70%      70–80%      80–90%

U.S. senator before election Russell Long Democratic Elected U.S. Senator Russell Long Democratic

On August 17, Long won the Democratic primary with 74.75% of the vote. At this time, Louisiana was a one-party state and the Democratic nomination was tantamount to victory. Long won the November general election without an opponent.