The Lake Tarleton State Park is a state park in Piermont, New Hampshire. It is best noted for being an undeveloped park, providing the public with an access to a place where they can get the rare experience of untouched nature.

Covering about 48 acres worth of land area, the Lake Tarleton State Park is perfect for several outdoor activities. Featuring the 315-acre Lake Tarleton, it allows visitors to go swimming, picnicking, and fishing. Boating is also available, although the boat launch is located less than a quarter mile from the park itself, at the New Hampshire Fish and Game area.

Like many other New Hampshire state parks, the Lake Tarleton State Park is unstaffed but is open year round for free. Parking is also available at the park.