1966 Democratic Senate primary election in Louisiana
Ellender: 50–60% 60–70% 70–80% 80–90% >90%
The 1966 United States Senate election in Louisiana was held on November 8, 1966. Incumbent Democratic Senator Allen Ellender was elected to a sixth term in office.
On August 13, Ellender won the Democratic primary with 74.17% of the vote. At this time, Louisiana was a one-party state and the Democratic nomination was tantamount to victory. Ellender won the November general election without an opponent.