O'Brien Baronets, of Merrion Square and Boris-in-Ossory (1849)
- Sir Timothy O'Brien, 1st Baronet (1787–1862)
- Sir Patrick O'Brien, 2nd Baronet (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)
The baronetcy is presently considered Dormant as the present holder has not proven his claim to the title.
- Timothy John O'Brien, presumed 7th Baronet (born 1958), grandson of the 6th Baronet
The heir presumptive to the 7th Baronet is the second and youngest son of the 6th Baronet, James Patrick O'Brien (born 1964).
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