Estherwood is a late 19th-century mansion located on the campus of The Masters School in Dobbs Ferry, New York, United States. It was the home of industrial tycoon James Jenning McComb, who supported Masters financially in its early years when his daughters attended. The house's octagonal library was the first section built. It had been attached to McComb's previous home, but he had felt it deserved a house more in keeping with its style and so had architect Albert Buchman design Estherwood built around it.