| Province: | SK |
| Type: | Hwy |
| Route: | 340 |
| Photo Width: | 250 |
| Length Km: | 30.4 |
| Length Round: | 1 |
| Direction A: | South |
| Direction B: | North |
| Terminus B: | at Hafford |
| Rural Municipalities: | Great Bend, Redberry |
| Previous Type: | Hwy |
| Previous Route: | 339 |
| Next Type: | Hwy |
| Next Route: | 342 |
Highway 340 is a provincial highway in the Canadian province of Saskatchewan. It runs from Highway 16 at Radisson to Highway 40 at Hafford and intersects Highway 685. It is about long.