| State: | TN |
| Type: | Sec |
| Route: | 303 |
| Map Custom: | yes |
| Map Notes: | SR 303 highlighted in red |
| Alternate Name: | Cranmore Cove Road |
| Length Mi: | 5.7 |
| Established: | July 1, 1983[1] |
| Direction A: | South |
| Terminus A: | in Graysville |
| Direction B: | North |
| Terminus B: | just west of Dayton |
| Counties: | Rhea |
| Previous Type: | Sec |
| Previous Route: | 302 |
| Next Type: | Sec |
| Next Route: | 304 |
State Route 303 (SR 303) is a short 5.7adj=midNaNadj=mid state highway in Rhea County, Tennessee. For the majority of its length, it is known as Cranmore Cove Road.
SR 303 begins in Graysville at an intersection with US 27/SR 29. It goes north through downtown as Dayton Avenue before turning onto Cranmore Cove Road. The highway then goes northeast through a narrow valley between two ridges before coming to an end at an intersection with SR 30 just west of Dayton. The entire route of SR 303 is a two-lane highway.