Arnold Mills Historic District is a historic district encompassing a modest 19th-century mill village in eastern Cumberland, Rhode Island. The district lies along the Nate Whipple Highway (Rhode Island Route 120) and Sneech Pond Road, south of the Arnold Mills Reservoir. Sneech Pond Road was formerly the major east-west highway through the area prior to the construction of the Nate Whipple Highway in the 1960s.