Sycamore State Park is a 2,384-acre (965 ha) protected woodlands and public recreation park at 4675 N. Diamond Mill Road, in Trotwood, Ohio, United States. It is the only state park in Montgomery County, Ohio along Wolf Creek, a tributary of the Miami River, immediately west of Trotwood, east of Brookville, Ohio, and south of Clayton. The nearest city is Dayton, Ohio.