Beaver Brook State Park is an undeveloped public recreation area in Windham and Chaplin, Connecticut, centered on Bibbins Pond and extending north to the Air Line State Park Trail. Named for Beaver Brook, and possibly for an earlier beaver pond, it was assembled in stages during the 1950s as one of several recreation areas acquired with funds bequeathed by George Dudley Seymour. The park grew from 165 acres in 1955 to 401 acres by 1960. Managed as a walk-in facility, it is open for hunting and trout fishing, and Bibbins Pond offers seasonal access for non-motorized boating and fishing.