Greensfelder County Park is a 1,734-acre regional park in Wildwood, western St. Louis County, Missouri, preserving a broad wooded Ozark-edge landscape within the Henry Shaw Ozark Corridor. The land became a county park in 1963 after the St. Louis Regional Planning and Construction Foundation, established in 1939 by Albert P. Greensfelder, donated it to St. Louis County. It first opened as Rockwood Park and was renamed in 1965 to honor A. P. Greensfelder. Known for large-scale outdoor recreation, it includes trails, stables, campsites, and other facilities, with trail connections to nearby protected areas forming about 25 miles of routes.