State Route 313 (SR 313, OH 313) is a 34.38-mile (55.33 km) long east–west state highway located in the southeastern portion of the U.S. state of Ohio. The western terminus of SR 313 is at a T-intersection with SR 146 approximately 9.50 miles (15.29 km) northwest of the village of Cumberland. Its eastern terminus is near the eastern end of Senecaville Lake at a T-intersection with SR 147 nearly 3.50 miles (5.63 km) southwest of Batesville.