- male, deceased (1968)
- John Ambrose O'Brien, was the founding owner of the Montreal Canadiens ice hockey team. Born in Renfrew, Ontario, O'Brien—with the backing of his fa...
- male, 60 years old
- Larry O'Brien (born July 19, 1949 in Ottawa) is the current chair and director of Calian Technologies and its former CEO. O'Brien is currently...
- male, deceased (2005)
- George H. O’Brien, Jr. was a United States Marine Corps officer who was awarded the Medal of Honor, the United States's highest military de...
- female, deceased (1791)
- Mary O'Brien (c. 1721-1791) was the 3rd (modern) Countess of Orkney.
- male, deceased (1914)
- Peter O'Brien, Baron O'Brien (June 29 1842 - 7 September 1914) was an Irish lawyer who became Lord Chief Justice of Ireland. Born the fifth son of...
- male, deceased (1948)
- Sir Timothy (Tim) Carew O'Brien, 3rd Baronet was born at Dublin on 5 November, 1861 and died at Ramsey, Isle of Man on 9 December, 1948. He was an...
- male, deceased (1674)
- Murrough O'Brien, 1st Earl of Inchiquin (c. 1618-9 September 1674), known from 1624 to 1654 as the 6th Baron Inchiquin, was a chieftain of the...
- male, deceased (1930)
- Ignatius John O'Brien, 1st Baron Shandon (31 July 1857 - 10 September 1930) Irish lawyer and Lord Chancellor of Ireland.
- male, deceased (1995)
- Leslie Kenneth O'Brien, Baron O'Brien of Lothbury GBE (February 8, 1908 - November 24, 1995), was Governor of the Bank of England. He joined the...
- female, deceased (1756)
- Lady Anne Douglas-Hamilton was the 2nd Countess of Orkney in the Peerage of Scotland (3rd Creation, 1696), and through marriage the Countess...
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