Cedariver, formerly known as The Baker Reservation, is a 55-acre (22 ha) open space reserve located on the Charles River in Millis, Massachusetts. The property, acquired in 2004 by the land conservation non-profit organization The Trustees of Reservations, includes farm fields, woodlots, and 1-mile (1.6 km) of river frontage.

Cedariver is open to hiking, picnicking, car-top boating, cross country skiing, and other passive pursuits. A trailhead is located on Forest Road in Millis. The property was a 2004 gift of the family of Polly Baker.

• Cedariver The Trustees of Reservations
• Trail map

42°09′27″N 71°20′06″W / 42.1576°N 71.3351°W / 42.1576; -71.3351