Blenheim is a town in the southwestern part of Schoharie County, New York, United States.

The town was the site of raids and skirmishes during the American Revolution.

It was built in 1855 and existed until 2011, when it was destroyed by flooding caused by Tropical Storm Irene.

New York State Route 30 is a north-south highway in the eastern part of Blenheim.

At the 2020 census, there were 308 people living in 151 households in Blenheim, with an average age of 45.4 years.

28.7% of all households were made up of individuals, and 18.0% had someone living alone who was 65 years of age or older.

The elected town supervisor of Blenheim is Don Airey.