| Election Name: | 2018 Michigan Senate election |
| Country: | Michigan |
| Type: | legislative |
| Previous Election: | 2014 Michigan Senate election |
| Previous Year: | 2014 |
| Next Election: | 2022 Michigan Senate election |
| Next Year: | 2022 |
| Seats For Election: | 38 seats in the Michigan Senate |
| Majority Seats: | 20 |
| Party1: | Republican Party (United States) |
| Leader1: | Arlan Meekhof (term-limited) |
| Leaders Seat1: | 30th District |
| Leader Since1: | January 14, 2015 |
| Last Election1: | 26 |
| Seats Before1: | 27 |
| Seats After1: | 22 |
| Seat Change1: | 5 |
| Popular Vote1: | 1,973,098 |
| Percentage1: | 48.04% |
| Swing1: | 3.18% |
| Party2: | Democratic Party (United States) |
| Leader2: | Jim Ananich |
| Leader Since2: | January 14, 2015 |
| Leaders Seat2: | 27th District |
| Last Election2: | 12 |
| Seats Before2: | 11 |
| Seats After2: | 16 |
| Seat Change2: | 5 |
| Popular Vote2: | 2,064,029 |
| Percentage2: | 50.25% |
| Swing2: | 2.23% |
| Majority Leader | |
| Before Election: | Arlan Meekhof |
| Before Party: | Republican Party (United States) |
| Posttitle: | Elected Majority Leader |
| After Election: | Mike Shirkey |
| After Party: | Republican Party (United States) |
| Ongoing: | No |
| Map Size: | 400px |
The Michigan Senate elections of 2018 took place on November 6, 2018,[1] alongside elections to be Michigan's governor, Class I United States Senator, Attorney General, Secretary of State as well elections for Michigan's 14 seats in the United States House of Representatives and all 110 seats in the Michigan House of Representatives; to elect the 38 members that will comprise the Michigan Senate. The Republican, Democratic and Libertarian parties chose their nominees in a partisan primary on August 7, 2018.[1] The Working Class Party, U.S. Taxpayers Party, Green Party and Natural Law Party chose their nominees at state party conventions.[2]
Under the Michigan Constitution, members of the state Senate are able to serve only two four-year terms, and members of the House of Representatives are limited to three two-year terms. Michigan has what are considered the toughest term-limits in the country.[3] After the 2018 mid-term elections, nearly 70 percent of the state Senate and 20 percent of the state House will be forced to leave office because of term-limits.[4] The following members are prevented by term-limits from seeking re-election to the Senate in 2018. This list does not include members that are eligible for re-election, but instead chose to seek other office or voluntarily to retire.
Seats where the margin of victory was under 10%:
| align=center | District 1 • District 2 • District 3 • District 4 • District 5 • District 6 • District 7 • District 8 • District 9 • District 10 • District 11 • District 12 • District 13 • District 14 • District 15 • District 16 • District 17 • District 18 • District 19 • District 20 • District 21 • District 22 • District 23 • District 24 • District 25 • District 26 • District 27 • District 28 • District 29 • District 30 • District 31 • District 32 • District 33 • District 34 • District 35 • District 36 • District 37 • District 38 |
| 2 | Current member of House | |
| 3 | Former legislator |