Harmony Mills, in Cohoes, New York, United States, is an industrial district that is bordered by the Mohawk River and the tracks of the former Troy and Schenectady Railroad (now the Mohawk-Hudson bike trail). It was listed as Harmony Mills Historic District on the National Register of Historic Places in 1978. A portion of the district encompassing the industrial buildings and some of the housing built for millworkers was declared a National Historic Landmark in 1999. The centerpiece building, Harmony Mill No. 3 was listed on the National Register of Historic Places in 1971.