Ron Richard Republican Dave Schatz Republican The 2018 Missouri Senate elections were held on November 6, 2018, to elect the seventeen Missouri Senators to the Missouri Senate.

Half of the Senate's thirty-four seats are up for election every two years, with each Senator serving four-year terms.

The next time that these seats were up was in the 2022 Missouri Senate election.

Results of the 2018 Missouri State Senate elections by district:[1] Districts where the margin of victory was under 10%: