Route 275 is a state highway in northeastern Connecticut running from Coventry to the village of Storrs within the town of Mansfield, and serving as a western feeder to the main campus of the University of Connecticut.

It heads northeast for 1.7 miles (2.7 km) to the Willimantic River, crossing into the village of Eagleville within the town of Mansfield.

The westward continuation into Coventry (Stonehouse Road) had been town-maintained and unnumbered.

The state took over maintenance of Stonehouse Road (as an extension of SR 575) in 1962 as part of the Route Reclassification Act.

At an unconfirmed date after 1967, the section in the vicinity of the Coventry-Mansfield town line was realigned.