Sir Robert Carrington Cotton, KCMG, AO (29 November 1915 – 25 December 2006) was an Australian politician and diplomat. He was a member of the Liberal Party and served as a Senator for New South Wales from 1966 to 1978. He held ministerial office as Minister for Civil Aviation (1969–1972), Science and Consumer Affairs (1975), and Industry and Commerce (1975–1977). He later served as Consul-General in New York (1978–1982) and Ambassador to the United States (1982–1985).