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.Established in 1937, SR 557 runs exclusively within Holmes County.