State Route 135 (SR-135) is a 2.138-mile (3.441 km) state highway in southern Baldwin County in the southwestern part of the state. The southern terminus of the route is at its junction with State Route 182 at Gulf Shores. The northern terminus of the route is at its junction with State Route 180 in Gulf Shores.

State Route 135 serves as a connecting route between State Routes 182 and 180 and Gulf State Park. The route begins just north of the Gulf of Mexico and passes through a park.

The entire route is in Baldwin County.