State Route 662 (SR 662, OH 662) is a north–south state highway in the central part of Ohio, a U.S. state. The southern terminus of the route is at a T-intersection with State Route 209 nearly 5.50 miles (8.85 km) northwest of the city of Cambridge. Its northern terminus is also at a T-intersection, this time with State Route 93 approximately 3.50 miles (5.63 km) south of the village of Plainfield.