Robert O'Brien may refer to:
Sportspeople
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Robert O'Brien (cricketer) (1869–1922), Australian cricketer
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Robert O'Brien (racing driver) (1908–1987), American racing driver
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Bob O'Brien (basketball) (1927–2008), American basketball player
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Robert O'Brien (canoeist) (born 1933), American sprint canoer
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Bob O'Brien (baseball) (born 1949), baseball player
Others
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Robert J. O'Brien (1858–1948), American real estate developer, politician and philanthropist
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Robert O'Brien (executive)
Robert H. O'Brien (1907–1997) was an American businessman and Hollywood executive who was president of Metro-Goldwyn-Mayer during the 1960s.
O'Brien was a financial officer at Paramount Pictures for ten years, including treasurer of United Para ...
(1907–1997), American businessman
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Robert C. O'Brien (author) (1918–1973), American journalist and children's book author
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Robert O'Brien (artist) (born 1939), British Hong Kong artist
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Robert O'Brien (RAF officer) (active in 1990s), former US Air Secretary
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Robert C. O'Brien (born 1966), US National Security Advisor
{{hndis, Obrien, Robert