Coltsville Historic District is a National Historic Landmark District in Hartford, Connecticut. The district encompasses the factory, worker housing, and owner residences associated with Samuel Colt (1814-1862), one of the nation's early innovators in precision manufacturing and the production of firearms. It was the site of important contributions to manufacturing technology made by Colt and the industrial enterprise he created. Coltsville is a cohesive and readily identifiable 260 acres (1,100,000 m2) area, most of which was originally listed as the Colt Industrial District on the National Register of Historic Places in 1976. It was designated a National Historic Landmark in 2008.