| Province: | QC |
| Type: | QC |
| Route: | 257 |
| Map: | Route 257-QC.png |
| Length Km: | 85 |
| Length Round: | 1 |
| Direction A: | South |
| Direction B: | North |
| Length Ref: | [1] |
| Terminus A: | near Pittsburg, NH |
| Terminus B: | in Saint-Adrien |
| Junction: | at Weedon at Gould |
| Cities: | Weedon, Scotstown |
| Previous Type: | QC |
| Previous Route: | 255 |
| Next Type: | QC |
| Next Route: | 259 |
Route 257 is a north–south highway on the south shore of the St. Lawrence River, in the Eastern Townships region of Quebec, Canada. Its northern terminus is in Saint-Adrien at a junction with Route 216, and its southern terminus is at the Pittsburg–Chartierville Border Crossing, where it becomes U.S. Route 3 as it enters Pittsburg, New Hampshire.