John Graves Cobblestone Farmhouse is an American historic home located at Junius in Seneca County, New York. It is a late Federal style, two-story, three-bay wide side hall structure, with a one-story frame wing. It was built about 1837 and is constructed of irregularly sized and variously colored field cobbles. The house is among the approximately 18 surviving cobblestone buildings in Seneca County.