Route 115 is a 10.87-mile-long (17.49 km) south–north highway in southeastern Massachusetts.

Almost immediately, the route crosses the far northeastern corner of Wrentham before passing into the town of Norfolk.

In Norfolk the route crosses Route 1A before continuing northwestward, passing Stony Brook Pond and the Bristol Blake State Reservation before crossing through the center of town near the Norfolk commuter rail station.

Route 115 is in large part a scenic highway, mostly meandering through rather dense woods, with the exception being the town center of Millis, which is home to many shops and banks.

Route 115 also passes through the center of Norfolk, a much smaller and less developed town than Millis.