| State: | TN |
| Type: | SR |
| Route: | 31 |
| Maint: | TDOT |
| Map Custom: | yes |
| Map Notes: | TN 31 mainline in red |
| Length Mi: | 17.2 |
| Established: | October 1, 1923[1] |
| Direction A: | South |
| Terminus A: | in Mooresburg |
| Direction B: | North |
| Terminus B: | in Sneedville |
| Counties: | Hawkins, Hancock |
| Previous Type: | US |
| Previous Route: | 31A |
| Next Type: | SR |
| Next Route: | 32 |
State Route 31 (SR 31) is a 17.2miles north-south state highway in northeastern Tennessee. The highway runs from U.S. Route 11W in Mooresburg north to SR 66 in Sneedville.
SR 31 begins at a junction with US 11W/SR 1 in Mooresburg. The highway heads north into rural Hawkins County, passing through the community of Spruce Pine. While crossing over Clinch Mountain, the route crosses into Hancock County.[2] Past the mountain ridge, the highway intersects SR 131 in Treadway and briefly becomes a four-laned undivided Highway and continues northward through Luther and Duck Creek before turning northeast along the Clinch River.[3] The route then enters Sneedville, where it terminates at SR 66, which connects to SR 33 and Sneedville via a bridge.
The entire route of SR 31 is a narrow rural 2-lane mountain highway.[4]