Beaver Brook State Park is an undeveloped public recreation area covering 401 acres (162 ha) in the towns of Windham and Chaplin, Connecticut, United States. The state park encompass Bibbins Pond, also known as Beaver Brook Pond, as well as the acreage north of the pond; its name may derive from a beaver pond once present. Air Line State Park Trail forms the park's northern boundary. The park is a walk-in facility open for hunting and trout fishing, managed by the Connecticut Department of Energy and Environmental Protection.