Robert Duff is the name of:
Robert Duff (Royal Navy officer) (died 1787), admiral and governor for Newfoundland in 1775 Robert Duff (Newfoundland politician) (1868–1928), Newfoundland businessman and politician Sir Robert Duff (British politician) (1835–1895), Scottish Liberal politician, governor for New South Wales between 1893 and 1895
See also Duff (surname)