Route 215 is a state highway in southeastern Connecticut, running entirely within the town of Groton in a loop off US 1 through the Noank and West Mystic sections of Groton and also serves the Groton Long Point community.

It heads southeast towards Noank, passing by Haley Farm State Park along the way.

At the entrance to Groton Long Point, Route 215 turns east following South Elm Street into the village of Noank.

After passing through the center of the village, Route 215 turns north past Beebe Cove along Elm Street then proceeds northeast following Noank Road towards West Mystic.

The western half (old SR 670) was added in 1962 as part of the Route Reclassification Act.