People — J
John O'Brien
1847 – 1917
politician
John O'Brien
1866 – 1932
politician
John O'Brien
1924 – 1990
politician
John O'Brien
1932 – 1985
politician
John O'Brien
John O'Brien
1927 – 1995
rower
John O'Brien
1871 – 1946
rugby union player
John O'Brien
b. 1932
tennis player
John O'Brien
1931 – 2020
water polo player
John O'Brien
1960 – 1994
writer
John O. Butler
dentist
John O'Byrne
1884 – 1954
judge
John O'Callaghan
b. 1982
disc jockey
John O'Callaghan
1865 – 1913
journalist
John O'Callaghan
1850 – 1899
military personnel
John O'Callaghan
b. 1988
singer
John O'Carroll
b. 1958
painter
John O. Colvin
1946 – 2024
judge
John O'Connell
1904 – 1992
baseball player
John O'Connell
association football player
John O'Connell
1951 – 1989
Australian rules football player
John O'Connell
1932 – 2026
Australian rules football player
John O'Connell
1872 – 1908
baseball player
John O'Connell Bianconi
1871 – 1929
businessperson
John O'Connell Bligh
1834 – 1880
police officer
John O'Connell
1927 – 2013
politician
John O'Connell
1810 – 1858
politician
John O'Connell
1826 – 1909
politician
John O'Connell
John O'Connell
b. 1959
television director
John O'Connor
1868 – 1952
cricketer
John O'Connor
1894 – 1977
athletics competitor
John O'Connor
b. 1958
composer
John O'Connor
1867 – 1936
cricketer
John O'Connor
1870 – 1952
curate
John O'Connor
hurler
John O'Connor
b. 1965
hurler
John O'Connor
1830 – 1889
painter
John O'Connor
1824 – 1887
politician
John O'Connor
1837 – 1891
politician
John O'Connor
1850 – 1928
politician
John O'Connor
1878 – 1937
politician
John O'Connor
politician
John O'Connor Power
1846 – 1919
barrister
John O'Conor
b. 1947
music educator
John O'Conor
rugby union player
John O. Dabiri
b. 1980
military flight engineer
John O'Day
politician
John O'Dea
1839 – 1905
John O. Deshong
1807 – 1881
banker
John O'Donnell
rugby union player
John O'Donnell
1749 – 1805
John O'Donnell
1910 – 1954
John O'Donnell
1947 – 2018
Australian rules football player
John O'Donnell
b. 1985
boxer
John O'Donnell
b. 1985
businessperson
John O'Donnell
1896 – 1961
journalist
John O'Donnell
b. 1962
journalist
John O'Donnell
b. 1890
poet
John O'Donnell
1827 – 1899
politician
John O'Donnell
1866 – 1920
politician
John O'Donnell
b. 1947
radio personality
John O'Donnell
1902 – 1990
rugby union player
John O'Donoghue
b. 1956
politician
John O'Donoghue
1931 – 2014
John O'Donoghue
b. 1939
baseball player
John O'Donoghue
b. 1969
baseball player
John O'Donoghue
b. 1942
hurler
John O'Donohoe
1824 – 1902
politician
John O'Donohue
1956 – 2008
poet
John O'Donovan
1806 – 1861
linguist
John O'Donovan
1889 – 1920
Gaelic football player
John O'Donovan
1858 – 1927
police officer
John O'Donovan
1908 – 1982
politician
John O'Dowd
1856 – 1937
poet
John O'Dowd
b. 1967
chef
John O'Driscoll
b. 1967
Gaelic football player
John O'Dwyer
b. 1991
hurler
John O'Fallon
1791 – 1865
businessperson
John O'Farrell
venture capitalist
John O'Farrell
b. 1962
journalist
John O'Farrell
1826 – 1892
politician
John O'Flynn
b. 1982
association football player
John O'Flynn
1750 – 1817
Catholic priest
John O'Gara
Gaelic football player
John O'Gorman
musician
John O'Gorman
b. 1936
rugby union player
John O'Grady
b. 1954
coach
John O'Grady
1940 – 2023
John O'Grady
1891 – 1934
athletics competitor
John O'Grady
1886 – 1966
economist
John O'Grady
1931 – 2024
hurler
John O'Grady
1907 – 1981
poet
John O. Griffiths
1923 – 2001
philatelist
John O'Hagan
1822 – 1890
lawyer
John O'Hagan
b. 1873
John O'Hagan
b. 1936
politician
John Ó hAirt
Catholic priest
John O'Halloran
b. 1943
hurler
John O'Halloran
1901 – 1979
Australian rules football player