St. Armand is a town in Essex County, New York, United States.

The town of St. Armand is in the northwestern corner of the county and is southwest of Plattsburgh.

Because the town was set at the conjunction of five roads, including New York Route 3, it became an active community.

By the end of the 19th century, the town had become the locale for sanatoria intended for tuberculosis (TB) cures.

Dr. Edward Trudeau, in 1884, was one of the first to establish a sanatorium within the town, near the village of Saranac Lake.

New York State Route 3 passes through the western part of the town.