State Route 511 (SR 511) is a 50.27-mile (80.90 km) long north–south state highway in the northern portion of the U.S. state of Ohio. The southern terminus of SR 511 is at a T-intersection with SR 39 about 2 miles (3.2 km) north of Perrysville. Its northern terminus is at a trumpet interchange with the U.S. Route 20 (US 20) freeway 0.75 miles (1.21 km) east of Oberlin.