The Mechanic Street Historic District encompasses a historic 19th-century mill and mill village in a 14-block area of the Pawcatuck section of Stonington, Connecticut. Extending along the Pawcatuck River and south of West Broad Street, the area includes a large brick mill complex on the banks of the river, and a neighborhood of well-preserved worker housing on the road grid to its west. The district was listed on the National Register of Historic Places in 1988.