The OC&E Woods Line State Trail is a rail trail in Klamath and Lake counties in the U.S. state of Oregon. It is Oregon's longest state park. The trail follows the old OC&E and Weyerhaeuser railroads from Klamath Falls to Thompson Reservoir. Along its 105-mile (169 km) length it passes through the communities of Olene, Sprague River, Dairy, Beatty, and Bly.

The Oregon, California and Eastern Railway (OC&E) was a 64-mile (103 km) rail line between Klamath Falls and Bly in the U.S. state of Oregon. After 70 years of bringing logs from nearby forests to local sawmills, the former railroad right of way was converted to the OC&E Woods Line State Trail.