| State: | TN |
| Type: | Sec |
| Route: | 420 |
| Map Custom: | yes |
| Map Notes: | TN 420 highlighted in red |
| Length Mi: | 4.7 |
| Direction A: | West |
| Terminus A: | in Fruitland |
| Direction B: | East |
| Terminus B: | in Gibson |
| Counties: | Gibson |
| Previous Type: | Sec |
| Previous Route: | 419 |
| Next Type: | US |
| Next Route: | 421 |
State Route 420 (SR 420) is a 4.7adj=midNaNadj=mid east-west state highway in Gibson County, Tennessee, connecting the community of Fruitland with the town of Gibson.
SR 420 begins in Fruitland at an intersection with US 45W/SR 5. It heads east through farmland and rural areas for several miles before entering Gibson and coming to an end at an intersection with SR 186 just north of downtown.[1] The entire route of SR 420 is a rural two-lane highway.