2018 Missouri Senate election

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.

District
Results of the 2018 Missouri State Senate elections by district:

Close races
Districts where the margin of victory was under 10%:
 * 1)  District 8, 9.38% 
 * 2)  District 30, 6.7% 
 * 3)  District 34, 4.94%