State Route 254 is an 14.77 miles (23.77 km) east–west state route in northern Ohio. The route begins at State Route 57 in Lorain and ends at U.S. Route 20 in Lakewood. SR 254 intersects Interstate 90 twice, both times near its endpoints. State Route 254 is known as Detroit Road for most of its routing, and as North Ridge Road at its western end.

The route has a signed eastern terminus at the intersection of Detroit Road and Wooster Road, which is also the signed terminus of State Route 113 and where a brief concurrency with U.S. Route 20 and Alternate U.S. Route 6 begins. The actual route continues via an unsigned concurrency with State Route 2's rejoining of U.S. Route 6. From there, it continues into Clifton before ending at the intersection of Clifton and West Clifton Road (the terminus of State Route 237 and the unsigned terminus of State Route 113), where U.S. Route 20 joins U.S. Route 6 and State Route 2 for a triple concurrency on Clifton throughout Lakewood.

The signed portion of State Route 254 on Detroit Road from the end of the State Route 2 concurrency to the eastern terminus is officially known as State Route 254 D.