Route 118 is a 16.88-mile-long (27.17 km) north-south state highway in Bristol County, Massachusetts.

In Rehoboth, the route heads northward, turning shortly westward along Brook Street before turning north on Moulton Street, which turns into Bay State Road near the town center before crossing U.S. Route 44.

The route then turns westward before bearing northwestward on Park Street into Attleboro.

Park Street passes through Briggs Corner and passing the Shrine of Our Lady of La Salette, known for its massive display of Christmas lights.

The southbound side passes Sturdy Memorial Hospital and the City Hall before both streets end at Route 123, just east of the main rail route between Boston and Providence.