| 66th Massachusetts General Court | |
| Body: | General Court |
| Session1 End: | [1] |
| Before: | 65th |
| After: | 67th |
| Chamber1: | Senate |
| Membership1: | 40 |
| Chamber1 Leader1 Type: | President |
| Chamber1 Leader1: | Levi Lincoln |
| Chamber2: | House |
| Membership2: | 271 |
| Chamber2 Leader1 Type: | Speaker |
| Chamber2 Leader1: | Samuel H. Walley, Jr. |
The 66th Massachusetts General Court, consisting of the Massachusetts Senate and the Massachusetts House of Representatives, met in 1845 during the governorship of George N. Briggs. Levi Lincoln served as president of the Senate and Samuel H. Walley, Jr. served as speakers of the House.[2]