Knickerbocker Mansion is a historic home located at Schaghticoke in Rensselaer County, New York.

It was acquired in 1964 by the Knickerbocker Historical Society and is operated as a local history museum.

The Knickerbocker Mansion grounds were the location of the “Witenagemot Oak,” planted in 1676 to commemorate the signing of a treaty between New York governor Edmund Andros and the local Mahican people and native refugees from King Philip's War.

It has a hipped roof, covered in slate, that curves slightly at the eaves.

The front facade once featured a one-bay, pedimented entrance portico.