There have been fourbaronetcies created for persons with the surnameO'Brien, one in theBaronetage of Ireland and three in theBaronetage of the United Kingdom.
TheO'Brien Baronetcy, of Leaghmenagh in the County of Clare, was created in the Baronetage of Ireland on 9 November 1686; for more information seeBaron Inchiquin.
TheO'Brien Baronetcy, ofMerrion Square in Dublin and Boris-in-Ossory in Queen's County, was created in theBaronetage of the United Kingdom on 25 September 1849 forTimothy O'Brien. He was a merchant,Lord Mayor of Dublin andLiberalMember of Parliament forCashel. The second Baronet representedKing's County in theHouse of Commons as a Liberal for over thirty years. The third Baronet wasLord Lieutenant ofCounty Cork. The baronetcy has been considered dormant since the death of the 6th baronet in 1982 as the presumed 7th baronet does not appear on the Official Roll of the Baronetage.
TheO'Brien Baronetcy was created in the Baronetage of the United Kingdom on 28 September 1891; for more information seeBaron O'Brien.
TheO'Brien Baronetcy was created in the Baronetage of the United Kingdom on 15 January 1916; for more information seeBaron Shandon.
Holders and intermittent generations:
The baronetcy is presently consideredDormant as the present holder has not proven his claim to the title.[1]
Theheir presumptive after the presumed-only holder is the other patrilineal grandson of the 6th Baronet, James Patrick O'Brien (born 1964).
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