The 2018 United States Senate election in Arizona took place on November 6, 2018, to elect a member of the United States Senate to represent the State of Arizona and replace incumbent Republican Senator Jeff Flake, who did not run for reelection to a second term. It was held concurrently with a gubernatorial election, other elections to the U.S. Senate, elections to the U.S. House of Representatives, as well as various other state and local elections.