Robert O'Brien

Robert O'Brien may refer to:

• Robert O'Brien (cricketer) (1869–1922), Australian cricketer
• Robert O'Brien (racing driver) (1908–1987), American racing driver
• Bob O'Brien (basketball) (1927–2008), American basketball player
• Robert O'Brien (canoeist) (born 1933), American sprint canoer
• Bob O'Brien (baseball) (born 1949), baseball player

• Robert J. O'Brien (1858–1948), American real estate developer, politician and philanthropist
• Robert O'Brien (executive) (1907–1997), American businessman
• Robert C. O'Brien (author) (1918–1973), American journalist and children's book author
• Robert O'Brien (artist) (born 1939), British Hong Kong artist
• Robert O'Brien (RAF officer) (active in 1990s), former US Air Secretary
• Robert C. O'Brien (born 1966), US National Security Advisor