State Route 690 (SR 690) is a north–south state highway in southeastern Ohio, a U.S. state. The southern terminus of SR 690 is at the concurrency of US 50 and SR 32 about 6.50 miles (10.46 km) east of Athens in the community of Canaanville. Its northern terminus is at SR 550 approximately 2 miles (3.2 km) west of Amesville. This two-lane state highway was established in the late 1930s.