Route 191 is a state highway in northern Connecticut, running from East Windsor to Enfield.

Route 191 begins as Phelps Road at an intersection with US 5 in the town of East Windsor.

It continues across the Scantic River, then northeast along the river following Mill Street to the village of Broad Brook, where it then turns northward along Main Street.

Route 140 joins Main Street from the west about 0.8 miles (1.3 km) later, then after overlapping Route 140 into the village of Melrose, Route 191 continues north along Broad Brook Road into the town of Enfield.

In 1962, as part of a series of realignments triggered by the opening of the Bradley Airport Connector, the western section of Route 140 and the southern section of Route 191 were exchanged.