The 1984 United States Senate election in Michigan was held on November 6, 1984. Incumbent
Democratic U.S. Senator
Carl Levin won re-election to a second term, defeating
Republican candidate and former astronaut
Jack Lousma. Coinciding with Republican
Ronald Reagan's landslide in
Michigan and the
rest of the country, this was the only Senate election of Levin's career in which his percentage of the vote and margin of victory decreased from the previous one.