Bradley Palmer State Park is a public recreation area covering 736 acres (298 ha) on the Ipswich River in the towns of Hamilton and Topsfield, Massachusetts. The state park was once the estate of noted attorney Bradley Palmer. In addition to an extensive system of multi-use trails, the park features Palmer's restored Willowdale Mansion. The mansion is now home to Willowdale Estate, a premier event venue. Bordered on the north by the Ipswich River and Willowdale State Forest, the park is managed by the Department of Conservation and Recreation.