Robert Thorne or Thorn may refer to:
Robert Thorne (explorer), (c.1460-1519) Bristol merchant and explorer Robert Thorne (merchant) (1492–1532), Bristol merchant, cartographer and promoter of Arctic exploration Robert Thorne (typographer) (1754–1820), English typefounder Robert Thorne (cricketer) (1860–1930), English cricketer Robert J. Thorne (1875–1955), American businessman Robert C. Thorne (1898–1960), American paleontologist Robert Folger Thorne (1920–2015), American botanist Robert Thorn, a fictional character and the protagonist of the 1976 horror film The Omen Robert Thorne (racing driver), member of the automobile racing team K-Pax Racing Robert Thorne (lawyer), former CEO of Dualstar