Route 119 is a 35.60-mile-long (57.29 km) northwest-southeast state highway in Massachusetts.

In Ashby, Route 119 passes through the center of town, crossing Route 31 before passing through Willard Brook State Forest into the town of Townsend.

The route continues eastward, crossing the far western corner of Groton before entering Pepperell.

The two routes continue southeastward, passing Nagog Pond as they enter Acton.

The routes head southward from the junction, passing through East Acton before turning more eastward as they enter Concord.