The North River Wildlife Sanctuary is a wildlife sanctuary owned by the Massachusetts Audubon Society, the largest conservation organization in New England, in the town of Marshfield, Massachusetts. The sanctuary contains 184 acres (0.74 km2) of mixed cultural grasslands, red maple swamps, oak-pine woodland and access to the North River. The North River Wildlife Sanctuary came to Mass Audubon as a gift of the Killam and Rodgers families in 1977.