State Route 115 (SR 115, OH 115) is a 21.71-mile (34.94 km) long north–south state highway in the western portion of the U.S. state of Ohio. The highway has its southern terminus at a T-intersection with SR 65 in the northernmost portion of the city of Lima. The northern terminus of SR 115 is at a T-intersection with SR 15 approximately 3.75 miles (6.04 km) southeast of the village of Continental.