The 1984 United States Senate election in Kentucky was held on November 5, 1984. Incumbent Democratic U.S. Senator Walter Huddleston ran for reelection to a third term, but was defeated by RepublicanMitch McConnell by less than 0.5%. In spite of President Ronald Reagan's landslide reelection victory, this was the only Senate seat picked up by Republicans in 1984.
Huddleston was unopposed in the Democratic Party's primary. Governor John Y. Brown Jr. filed to run in March 1984, but withdrew for health reasons a few weeks later.