Cunningham Falls State Park is a public recreation area located west of Thurmont, Maryland, in the United States. The state park is the home of Cunningham Falls, the largest cascading waterfall in Maryland, a 43-acre man-made lake, and the remains of a historic iron furnace. The park is one of several protected areas occupying 50-mile-long Catoctin Mountain; it is bordered on its north by Catoctin Mountain Park and on its south by Frederick Municipal Forest.