Addison Mitchell McConnell III is an American politician and retired attorney who has served as Senate Minority Leader since 2021 and the senior United States senator from Kentucky since 1985, the longest serving senator in his state's history. He previously served as minority leader from 2007 to 2015, majority leader from 2015 to 2021 and was majority whip from 2003 to 2007. McConnell has been the leader of the Senate Republican Conference since 2007, making him the longest serving Senate party leader in U.S. history.

The positions of majority leader and minority leader are held by two United States senators and people of the party leadership of the United States Senate. They serve as a chief spokespersons for their respective political parties holding the majority and the minority in the United States Senate. They are each elected as majority leader and minority leader by the senators of their party caucuses: the Senate Democratic Caucus and the Senate Republican Conference.