| State: | OH |
| Type: | OH 1948 |
| Route: | 612 |
| Map: | OH 612 map (1951).svg |
| Map Notes: | Route of SR 612 in red |
| Length Mi: | 10.1 |
| Length Round: | 1 |
| Formed: | 1937 |
| Deleted: | 1951 |
| Direction A: | South |
| Terminus A: | on the North Royaltion–Strongsville line |
| Direction B: | North |
| Terminus B: | in Cleveland |
| Counties: | Cuyahoga |
| Previous Type: | SR |
| Previous Route: | 611 |
| Next Type: | SR |
| Next Route: | 613 |
State Route 612 (SR 612) was a state route located in Cuyahoga County, Ohio. The route existed from 1937 until 1951.
SR 612 traveled on what is now West 130th Street in western Cuyahoga County. The route began at SR 82 on the Strongsville–North Royalton line. It continued northward, traversing along the borders of Stongsville, North Royalton, Middleburg Heights, Parma, Brook Park, and Parma Heights, before intersecting SR 17 on the border of Cleveland and Parma. The highway continued further north to SR 10 in Cleveland, where it terminated.
SR 612 was formed in 1937, running between SR 82 and SR 17.[1] In 1939, the northern terminus for SR 612 was extended an extra 3miles, to a new terminus at SR 10 in Cleveland.[2] The route was deleted from the state highway system in 1951.[3]