Austerlitz is a town in Columbia County, New York, United States. The population was 1,625 at the 2020 census. The town was named after the Battle of Austerlitz.

Columbia County is a county in the U.S. state of New York. At the 2020 census, the population was 61,570. The county seat is Hudson. The name comes from the Latin feminine form of the surname of Christopher Columbus, which was at the time of the formation of the county a popular proposal for the name of the United States. The county is part of the Capital District region of the state.