| State: | AL |
| Type: | AL |
| Route: | 178 |
| Map Custom: | yes |
| Maint: | ALDOT |
| Length Mi: | 1.956 |
| Length Ref: | [1] |
| Direction A: | West |
| Terminus A: | at Fulton |
| Direction B: | East |
| Terminus B: | Main Street in Fulton |
| Counties: | Clarke |
| Previous Type: | AL |
| Previous Route: | 177 |
| Next Type: | AL |
| Next Route: | 179 |
State Route 178 (SR 178) is a 1.956adj=midNaNadj=mid route in Clarke County in the southwestern part of the state. The western terminus of the route is at its junction with US 43 north of Grove Hill. The route ends at the city center of Fulton.
SR 178 is a 2adj=midNaNadj=mid spur of US 43. Traveling east from US 43, the route travels along a two-lane road, connecting the small town of Fulton to the U.S. highway.