The Armour-Stiner House is located in Irvington, NY

The Armour–Stiner House, also known as the Carmer Octagon House, is a unique octagon-shaped and domed Victorian style house located at 45 West Clinton Avenue in Irvington, in Westchester County, New York.

It was designated a National Historic Landmark in 1976. It is known that other domed octagonal residences were built in the United States, but it is unknown if any of them still exist. The house was built in 1859–1860 by financier Paul J. Armour based on the architectural ideas of Orson Squire Fowler, the author of The Octoagon House: A Home for All Occasions. Fowler believed that octagonal houses enclosed more space, provided more interior sunlight, and that its rooms were easily accessible to each other. The architect of the house is unknown.

It is the only known octagonal house based on the domed colonnade shape of a Ropman temple. The dome was added and the house was enlarged during 1872–1876 by Joseph Stiner, who was a tea importer. The Armour–Stiner House is said to be one of the most lavish octagon houses built in the period, and is now one of only perhaps a hundred still extant. The house was the main setting for the 1981 horror film The Nesting.