Adirondack Iron and Steel Company is a historic ironworks complex located at Tahawus in Essex County, New York. It consists of the remains of the "Upper Works" iron foundry that date back to 1826. Iron from the site was contaminated with titanium, which, together with its isolation, made for an unprofitable venture.

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Adirondack Iron and Steel Company
U.S. National Register of Historic Places
Ruins of the 1854 Blast Furnace, July 2008
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Location	Upper Works Rd., near Tahawus, New York
Coordinates	44°4′41″N 74°3′22″W
Area	809 acres (327 ha)
Built	1854
NRHP reference No.	77000940[1]
Added to NRHP	October 5, 1977

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It was listed on the National Register of Historic Places in 1977.^[1]