1984 United States Senate election in Louisiana

The primary election for the 1984 United States Senate election in Louisiana was held on September 29, 1984.

Incumbent Democratic Senator J. Bennett Johnston won the election with 85% of the vote and was declared elected by a majority, dispelling the need for a general election in November. This was despite Republican president Ronald Reagan carrying the state with more than 60% of the vote in the concurrent presidential election.

Democratic Party

 * J. Bennett Johnston, incumbent Senator

Republican Party

 * Larry Napoleon "Boogaloo" Cooper, former President of the NAACP Youth Council and candidate for Lt. Governor in 1983
 * Robert M. Ross, perennial candidate

General election
Under Section 511 of Title 18 of the Louisiana Revised Statutes, a candidate who received a majority of the votes in the Primary Election was declared elected. Johnston did not appear on the General Election ballot.