Hillman State Park is a 3,600-acre Pennsylvania state park in Hanover Township, Washington County in the United States. It is about 25 miles west of Pittsburgh. The park opened in the late 1960s and has been managed for hunting by the Pennsylvania Game Commission since the early 1980s. The park also has hiking, cross-country skiing, horseback riding, a radio-controlled aircraft field, and mountain bike trails that are open to the public. The largely undeveloped park is north of U.S. Route 22 and east of Pennsylvania Route 18 in northern Washington County near the village of Bavington and the borough of Burgettstown.