Ohio State Route 662

State Route 662 (SR 662 or OH 662) is a north–south state highway located in the central region of the U.S. state of Ohio. The route functions primarily as a rural connector, linking State Route 209 and State Route 93 while providing access to agricultural land, isolated residences, and local road networks across three counties.

The highway extends for 8.18 miles (13.16 km), beginning at its southern terminus at a T-intersection with State Route 209 approximately 5.50 miles (8.85 km) northwest of the city of Cambridge. Its northern terminus is located at a T-intersection with State Route 93 roughly 3.50 miles (5.63 km) south of the village of Plainfield. Throughout its entire length, SR 662 remains a two-lane, undivided roadway and does not pass through any incorporated municipalities.