R. B. Winter State Park is a Pennsylvania state park on 695 acres in Hartley Township, Union County, Pennsylvania in the United States. It is in the ridge and valley region of Pennsylvania and is surrounded by Bald Eagle State Forest. R. B. Winter State Park is in a shallow basin that is surrounded by ridges. Halfway Lake is the central recreational focus of the park. The park is 18 miles west of Lewisburg on Pennsylvania Route 192.