Lyonsdale is a town in Lewis County, New York, United States.

[4] The town is named after its principal community and its founder Caleb Lyon.

Caleb Lyons, the town founder, was an advocate of the Black River Canal.

The traditional economy has been based on forest products, such as wood pulp.

22.4% of all households were made up of individuals, and 13.0% had someone living alone who was 65 years of age or older.