Lake Dennison Recreation Area is a state park and recreational facility located in Winchendon, Massachusetts. The area occupied by the park is owned by the Army Corps of Engineers ? Birch Hill Flood Control Project, but the land area is managed for recreational use by the State of Massachusetts through its Department of Conservation and Recreation.

The Lake Dennison Recreation Area is built around the Lake Dennison. The Lake itself and the surrounding earthen ramparts are actually part of a massive flood control project and covers over 4,221 acres of various land types that are suitable for alternate use such as recreational activities and facilities.

The park itself features a swimming beach, several picnic areas, 150 campsites, and other recreational facilities.