The Historic Washington State Park is a historic district and museum village located at Washington city in Hempstead County, Arkansas. Opened in 1973 as Old Washington Historic State Park, this 101-acre land contains 54 historic buildings that were built way back to the 1800s. Thirty of these buildings are considered historically and architecturally significant.

More than 200,000 artifacts from the site depicting the 19th century life were recovered and archeological studies are still ongoing inside the park. The park provides an outdoor gallery of historic buildings featuring architectural styles that were popular during the 19th century such as Southern Greek Revival, Gothic Revival and Federal Architecture. Another feature of the park is the almost 200-year old magnolia tree. The whole town was added to the National Register of Historic Places.