State Route 197 (SR 197) is 25.28-mile (40.68 km) east–west state highway in the western part of the U.S. state of Ohio. The western terminus of SR 197 is at a signalized intersection in downtown Celina that marks the junction of U.S. Route 127 (US 127), SR 29 and SR 703. SR 197 has its eastern terminus at SR 198 nearly 2 miles (3.2 km) southeast of the village of Buckland.