Lake Tarleton State Park is a forty-eight-acre state park in Piermont, New Hampshire, on the shore of Lake Tarleton. Undeveloped and focused on simple outdoor recreation rather than built facilities, it offers an unguarded swimming beach and lake access for canoeing and fishing. Hunting is allowed in season, and visitors also use the park for hiking and picnicking. Its significance lies in providing a small, straightforward lakeside recreation area centered on natural access and low-key outdoor activity.