2012 Tennessee Senate election
The 2012 Tennessee State Senate election was held on November 6, 2012, to elect 16 of the 33 seats for the Tennessee's State Senate. The elections coincided with the Presidential, 2012 United States [Senate election in Tennessee|U.S. Senate], 2012 United States [House of Representatives elections in Tennessee|U.S. House], and State House elections. The primary elections were held on August 2, 2012.
Republicans gained 6 seats, getting a supermajority in the Senate chamber.
Retirements
Five incumbents did not run for re-election in 2012. Those incumbents are:Democrats
- District 10: Andy Berke retired to run for mayor of Chattanooga in 2013.
- District 16: Eric Stewart retired to run for Tennessee's 4th congressional district seat in the U.S. House of Representatives.
- District 20: Joe M. Haynes retired.
- District 24: Roy Herron retired.
Republicans
- District 18: Kerry Roberts retired.
Incumbents defeated
In the primary election
Democrats
- District 30: Beverly Marrero lost renomination to Jim Kyle.
In the general election
Democrats
- District 22: Tim Barnes lost to Mark Green
Results summary
Closest races
Three races were decided by a margin of under 10%:| District | Winner | Margin |
| District 22 | data-sort-value=1 | 6.16% |
| District 20 | data-sort-value=1 | 8.16% |
| District 10 | data-sort-value=1 | 8.64% |
Detailed results by State Senate District
District 16
General election
Results by county| County | Green | % | Barnes | % | Total |
| Houston | 1,317 | 45.23% | 1,595 | 54.77% | 2,912 |
| Montgomery | 28,197 | 53.66% | 24,348 | 46.34% | 52,545 |
| Stewart | 2,449 | 51.42% | 2,314 | 48.58% | 4,763 |