Robert O'Brien may refer to: Robert O'Brien (artist) (born 1939), from British Hong Kong Robert O'Brien (canoeist) (born 1933) Robert O'Brien (executive) (1907–1997), Hollywood businessman Robert O'Brien (racing driver) (1908–1987), American Robert O'Brien (RAF officer) (active 1990s), former Air Secretary Robert C. O'Brien (attorney) (born 1966), US National Security Advisor Robert C. O'Brien (author) (1918–1973), US journalist and children's book author Bob O'Brien (born 1949), baseball player Bob O'Brien (basketball) (1927–2008)