State Route 657 (SR 657, OH 657) is a state highway in central Ohio, a U.S. state. While signed as a north–south route, State Route 657 actually travels in a northwest–southeast fashion. The southern terminus of the route is at a T-intersection with State Route 13 immediately north of the city limits of Newark. Its northern terminus is at a T-intersection with the duplex of U.S. Route 36 and State Route 3 about 1 mile (1.6 km) northeast of Centerburg.

This state highway passes through the northwestern quadrant of Licking County and the southwestern corner of Knox County. State Rout 657 is not included as a part of the National Highway System, a system of routes deemed most important for the nation's economy, mobility and defense.

State Route 657 was established in 1937 along the routing between State Route 13 and the U.S. Route 36/State Route 3 duplex that it occupies today. No significant changes have taken place to the routing of State Route 657 since its debut.