Hartsville is a town in Steuben County, New York, United States.

[2] The town is named after a prominent early settler, Reuben Hart.

The Town of Hartsville is on the county's western border and is south of Hornell.

The early lumber industry gradually converted to raising dairy cows as land was cleared.

23.6% of all households were made up of individuals, and 6.4% had someone living alone who was 65 years of age or older.