| State: | ME |
| Type: | ME |
| Route: | 131 |
| Map Custom: | yes |
| Length Mi: | 58.49 |
| Length Ref: | [1] |
| Direction A: | South |
| Terminus A: | Drift Inn Road / Glenmere Road in St. George |
| Junction: | |
| Direction B: | North |
| Terminus B: | in Swanville |
| Counties: | Knox, Waldo |
| Previous Type: | ME |
| Previous Route: | 130 |
| Next Type: | ME |
| Next Route: | 132 |
State Route 131 (SR 131) is a NaNadj=midNaNadj=mid state route in the U.S. state of Maine. Its southern terminus is in the St. George community of Port Clyde, at a dead end near the Port Clyde Harbor. Its northern terminus is in Swanville, at the intersection with SR 141.