The 1920 United States Senate election in Louisiana was held on November 2, 1920. Incumbent senator Edward J. Gay did not run for re-election.
On September 14, Edwin S. Broussard won the Democratic primary with 45.74% of the vote.
At this time, Louisiana was a one-party state, and the Democratic nomination was tantamount to victory. Broussard won the November general election without an opponent.