North Grosvenordale is a village and census-designated place in the town of Thompson in Windham County, Connecticut, United States. The population was 1,530 at the 2010 census. The core of the village is listed as the North Grosvenordale Mill Historic District on the National Register of Historic Places. The historic area around the cotton mill was listed in 1993 and is located on Riverside Drive, Buckley Hill Road, Floral Avenue, Market Lane, and Marshall, Central, River, and Holmes Streets.