State Route 557 (SR 557, OH 557) is a two-lane north–south state highway in the central portion of Ohio, a U.S. state. The highway's southern terminus is at a T-intersection with State Route 643 approximately 2 miles (3.2 km) north of Baltic. Its northern terminus is at a T-intersection with the concurrency of U.S. Route 62 and State Route 39 nearly 1.5 miles (2.4 km) west of the unincorporated community of Berlin.