State Route 615 (SR 615) is a 6.93-mile (11.15 km) long north–south state highway in the northeastern portion of the U.S. state of Ohio. SR 615 runs from its southern terminus at a signalized intersection with SR 306 in Kirtland to its northern terminus at a signalized intersection with SR 283 on the boundary between Mentor and Mentor-on-the-Lake.