Route 120 is a numbered state highway running 4.2 miles (6.8 km) in the U.S. state of Rhode Island.

It runs along the Nate Whipple Highway for its entire length.

Its western terminus is at Route 122 in Cumberland and the eastern terminus is at the Massachusetts border where it continues as Massachusetts Route 120.

Signage very clearly shows this to be incorrect.

The routing shown on most maps continues Route 120 north on Route 122 for about one block, then heading southwest on Manville Hill Road to Route 126, where it travels north with Route 126 to Sayles Hill Road, then southwest on Sayles Hill Road to Route 146.