Robert Stuart may refer to:
- Robert Stuart (British Army officer) (c. 1812–1901), British Army officer and veteran of the Crimean War
- Robert Stuart (explorer) (1785–1848), Scottish-born American fur trader
- Robert Stuart, Duke of Kintyre and Lorne (1602–1602), fifth child of James VI of Scots and Anne of Denmark
- Robert Stuart (businessman) (1852–1926), co-founder of the Quaker Oats Company
- Robert L. Stuart (1806–1882), American businessman and philanthropist
- R. Douglas Stuart (1886–1975), United States businessman and United States ambassador to Canada
- Robert D. Stuart Jr. (1916–2014), Quaker Oats heir and founder of the 1940 America First Committee
- Robert Stuart (cricketer) (1908–1986), Argentine cricketer
- Robert Stuart, 11th Lord Blantyre (1777–1830), British Army officer
- Robert Y. Stuart (1883–1933), United States Forest Service administrator
- Bobby Stuart (1913–1987), footballer