Route 100 is a numbered state highway running 9.3 miles (15.0 km)[1] in Rhode Island.

Route 100's southern terminus is at Route 102 in Glocester and the northern terminus is a continuation as Wallum Lake Road near Douglas, Massachusetts.

Route 100 takes the following route through the State: Route 100 becomes an unnumbered road (Wallum Lake Road) in Massachusetts.

The entire route is in Providence County.