There have been four baronetcies created for persons with the surname O'Brien, one in the Baronetage of Ireland and three in the Baronetage of the United Kingdom. The O'Brien Baronetcy, of Leaghmenagh in the County of Clare, was created in the Baronetage of Ireland on 9 November 1686; for more information see Baron Inchiquin. The O'Brien Baronetcy, of

Merrion Square Merrion Square () is a Georgian garden square on the southside of Dublin city centre. History The square was laid out in 1752 by the estate of Viscount FitzWilliam and was largely complete by the beginning of the 19th century. The demand fo ...

in Dublin and Boris-in-Ossory in Queen's County, was created in the Baronetage of the United Kingdom on 25 September 1849 for Timothy O'Brien. He was a merchant,

Lord Mayor of Dublin The Lord Mayor of Dublin ( ga, Ardmhéara Bhaile Átha Cliath) is the honorary title of the chairperson ( ga, Cathaoirleach, links=no ) of Dublin City Council which is the local government body for the city of Dublin, the capital of Ireland. Th ...

and

Liberal Liberal or liberalism may refer to: Politics * a supporter of liberalism ** Liberalism by country * an adherent of a Liberal Party * Liberalism (international relations) * Sexually liberal feminism * Social liberalism Arts, entertainment and m ...

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for Cashel. The second Baronet represented King's County in the

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as a Liberal for over thirty years. The third Baronet was Lord Lieutenant of

County Cork County Cork ( ga, Contae Chorcaí) is the largest and the southernmost county of Ireland, named after the city of Cork, the state's second-largest city. It is in the province of Munster and the Southern Region. Its largest market towns a ...

. In 2017 the seventh and present Baronet (Devin James Connor O’Brien) claimed succession and was listed in the Official Roll of the Baronetage. The baronetcy was considered temporarily dormant from 2013 to 2017 while this claim was verified. For more information, follow thi
link.
The O'Brien Baronetcy was created in the Baronetage of the United Kingdom on 28 September 1891; for more information see Baron O'Brien. The O'Brien Baronetcy was created in the Baronetage of the United Kingdom on 15 January 1916; for more information see Baron Shandon.

O'Brien baronets of Leaghmenagh (1686)

*see Baron Inchiquin

O'Brien baronets, of Merrion Square and Boris-in-Ossory (1849)

Holders and intermittent generations: * Sir Timothy O'Brien, 1st Baronet (1787–1862) *

Sir Patrick O'Brien, 2nd Baronet Sir Patrick O'Brien, 2nd Baronet (1823 – 26 April 1895) was an Irish politician. He was elected in 1852 as a member of parliament for King's County (now County Offaly), and held the seat until the constituency was divided at the 1885 gener ...

(1823–1895) * Sir Timothy Carew O'Brien, 3rd Baronet (1861–1948) *Sir Robert Rollo Gillespie O'Brien, 4th Baronet (1901–1952) *Sir John Edmond Noel O'Brien, 5th Baronet (1899–1969) *Sir David Edmond O'Brien, 6th Baronet (1902–1982) **John David O'Brien (1928–1980) ***Timothy John O'Brien (1958-) ''The baronetcy is presently considered Dormant as the present holder has not proven his claim to the title.'' ''The

heir presumptive An heir presumptive is the person entitled to inherit a throne, peerage, or other hereditary honour, but whose position can be displaced by the birth of an heir apparent or a new heir presumptive with a better claim to the position in question. ...

after the presumed-only holder is the other patrilineal grandson of the 6th Baronet, James Patrick O'Brien (born 1964).''

O'Brien baronets (1891)

*see Baron O'Brien

O'Brien baronets (1916)

*see Baron Shandon

Notes

References