Furnas is a surname. Notable people with the surname include:
Charles Furnas (1880–1941), first airplane passenger Clifford C. Furnas (1900–1969), author, Olympic athlete, scientist, expert on guided missiles, university president, and public servant Doug Furnas (1959–2012), American wrestler and powerlifter George Furnas (born 1954), professor and Associate Dean for Academic Strategy at the School of Information of the University of Michigan J. C. Furnas (1906–2001), American writer and historian Robert Wilkinson Furnas (1824–1905), second governor of Nebraska, USA