Massachusetts held special elections on November 7, 2023, deciding 1 legislative seat.
Legislature
- House (160 seats): 133 D, 26 R, 1 other or vacant before the election, 133 D, 26 R, 1 other or vacant after; control stayed with Democrats.
- Senate (40 seats): 37 D, 3 R before the election, 0 D, 0 R after.
Legislative races
| Race | Winner | Others | Notes |
|---|---|---|---|
| Senate Worcester and Hampshire | Peter Durant (R) 54.5% | Jon Zlotnik (D) 45.4% | Flipped D to R |