Robert Douglas may refer to:

• Robert Langton Douglas (1864–1951), British art critic and director of the National Gallery of Ireland
• Robert Douglas (actor) (1909–1999), British actor
• Róbert Ingi Douglas (born 1973), Icelandic film director

• Robert Douglas, Count of Skenninge (1611–1662), Scottish-born field-marshal in the Swedish army
• Sir Robert Douglas, 3rd Baronet (died 1692), Scottish soldier
• Robert Douglas (1727–1809), career soldier, field marshal of the Netherlands
• Robert Percy Douglas (1805–1891), British Army officer who became Lieutenant Governor of Jersey
• Robert Douglas (Royal Navy officer) (1829–1910), British admiral

• Sir Robert Douglas of Lochleven (died 1547), Scottish courtier and landowner
• Robert Douglas, Provost of Lincluden (died 1609), Scottish landowner, courtier, and administrator
• Robert Douglas, 1st Viscount Belhaven (1573–1639), Scottish courtier
• Robert Douglas, 8th Earl of Morton (died 1649), Scottish nobleman
• Robert Douglas (British politician) (c.  1703–1745), MP for Orkney and Shetland, British army officer
• Robert Douglas (New Zealand politician) (1837–1884)
• Robert M. Douglas (judge) (1849–1917), North Carolina Supreme Court justice
• Robert Dick Douglas (1875–1960), American lawyer and son of Robert M. Douglas
• Robert Albert Douglas (1887–1959), contractor and political figure in Nova Scotia, Canada

• Robert Douglas (horticulturist) (1813–1897), English American horticulturalist and forestry consultant
• R. J. W. Douglas (1920–1979), Canadian geologist
• Robert M. Douglas (doctor) (born 1936), academic, researcher, and administrator

• Robert Noel Douglas (1868–1957), English cricketer and priest
• Robert Douglas (American football) (born 1982), retired American football fullback
• Rab Douglas (born 1972), Scottish football goalkeeper
• Rob Douglas (born 1971), American speed sailor

• Robert Douglas (minister) (1594–1674), minister in the Church of Scotland
• Sir Robert Douglas, 6th Baronet (1694–1770), Scottish genealogist
• Robert Douglas (bishop) (died 1716), Scottish prelate
• Robert Kennaway Douglas (1838–1913), British oriental scholar
• Robert Waite Douglas (1854–1931), Canadian librarian

• Bob Douglas (1882–1979), American sports manager, founder of the New York Renaissance
• Bobby Douglas (born 1942), wrestling coach
• Bobby Douglass (born 1947), American football player
• Robert Douglass Jr. (1809–1887), African-American artist and activist