State Route 178 (SR 178) is a 1.956-mile-long (3.148 km) 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.

Traveling east from US 43, the route travels along a two-lane road, connecting the small town of Fulton to the U.S.

[2] The entire route is in Fulton, Clarke County.