Missouri held special elections on November 8, 2011, deciding 4 legislative seats.
Legislature
- House (163 seats): 57 D, 106 R before the election, 56 D, 106 R, 1 other or vacant after; control stayed with Republicans.
- Senate (34 seats): 8 D, 26 R before the election, 8 D, 26 R after; control stayed with Republicans.
Legislative races
| Race | Winner | Others | Notes |
|---|---|---|---|
| House 15 | Chrissy Sommer (R) 49.29% | Paul Woody (D) 48.24%, Bill Slantz (L) 2.47% | |
| House 39 | Judy Morgan (D) 77.39% | Jamie Barker Landes (R) 22.61% | |
| House 41 | Brandon Ellington (D) 100% | Unopposed | |
| House 83 | Tracy McCreery (I) 43.94% | Jeff OConnell (D) 29.24%, Patrick J. Brennan (R) 26.81% | Flipped D to I |