2018 Tennessee Senate election
The 2018 Tennessee State Senate election was held on November 6, 2018, to elect 18 of the 33 seats for the Tennessee's State Senate. The elections coincided with the 2018 [Tennessee gubernatorial election|Governor], U.S. Senate, U.S. House, and State House elections. The primary elections were held on August 2, 2018.
Retirements
Three incumbents did not run for re-election in 2018. Those incumbents are:Democrats
- District 19: Thelma Harper retired.
- District 29: Lee Harris retired to run for mayor of Shelby County.
Republicans
- District 13: Bill Ketron retired to run for mayor of Rutherford County.
Incumbents defeated
In the primary election
Democrats
- District 33: Reginald Tate lost renomination to Katrina Robinson.
Results summary
Closest race
This race was decided by a margin of under 10%:| District | Winner | Margin |
| District 31 | data-sort-value=1 | 1.78% |