Altamont is a village located in the town of Guilderland in Albany County, New York, United States.

"[2] In colonial times, this area was part of the Manor of Rensselaerwyck, granted by the Dutch West India Company to Killian Van Rensselaer in 1630.

In the early 19th century Knowersville, was established in the rural part of Albany County, just below the Helderberg Mountains.

The train station which once served this formerly busy whistle stop is now the location of the Altamont Free Library.

[3] Hiram Griggs (1836–1909) was the first mayor of the village of Altamont and his house was listed on the National Register of Historic Places in 2010.

[4] Also listed on the National Register of Historic Places are the Delaware and Hudson Railroad Passenger Station, Fine Arts and Flower Building Altamont Fairground, Hayes House, and Lainhart Farm Complex and Dutch Barn.

[5] According to the United States Census Bureau, the village has a total area of 1.2 square miles (3.1 km2), all land.