William O'Brien (disambiguation)

William O'Brien (1852–1928) was an Irish journalist and politician.

William O'Brien may also refer to:

Other politicians

William O'Brien, 2nd Earl of Inchiquin (c. 1640–1692), Governor of Jamaica
William O'Brien (Nova Scotia politician) (1782–1854), political figure in Nova Scotia
William Smith O'Brien (1803–1864), Irish Conservative and Repeal MP and Young Ireland revolutionary
William J. O'Brien (1836–1905), United States Representative from Maryland, 1873–1877
William Smith O'Brien (Congressman) (1862–1948), U.S. Representative from West Virginia
William H. O'Brien (1871–?), Wisconsin State Assemblyman
William X. O'Brien (1881–1968), Irish Labour TD and trade union leader
William O'Brien (Australian politician) (1882–1953), New South Wales politician
William O'Brien (Fine Gael) (1918–1994), Irish Fine Gael TD and Senator from County Limerick
Bill O'Brien (British politician) (born 1929), British Labour MP for Normanton, 1983–2005
Billy O'Brien (politician) (1929–2012), American politician
William O'Brien (Minnesota) (1930–2007), American politician
William L. O'Brien (born 1951), former Speaker of the New Hampshire House of Representatives
William O'Brien (Rhode Island politician) (born 1969), American state legislator in Rhode Island

William O'Brien (American football), head football coach for the Southern Illinois Salukis
William O'Brien, National League baseball umpire in 1876
Billy O'Brien (1860–1911), baseball player
Bill O'Brien (footballer, born 1877), Australian rules footballer for Collingwood
Bill O'Brien (footballer, born 1887), Australian rules footballer for St Kilda
Bill O'Brien (footballer, born 1905), Australian rules footballer for South Melbourne
William O'Brien (footballer), Scottish footballer
Parry O'Brien (William Patrick O'Brien, 1932–2007), American shot-put innovator
Bill O'Brien (American football) (born 1969), American football coach

William O'Brien (judge) (1832–1899), Irish judge
William O'Brien, President, BATS Global Markets
Monsignor William B. O'Brien, founder and the president of the World Federation of Therapeutic Communities also co-founder of Daytop
William David O'Brien (1878–1962), auxiliary bishop of Chicago, Illinois, USA
William J. O'Brien (Medal of Honor) (1899–1944), United States Army officer during World War II
William J. O'Brien, inventor of the Decca Navigator System
William S. O'Brien (1825–1878), American businessman
William O'Brien, 3rd Earl of Inchiquin (1662–1719), Irish peer
William O'Brien, 4th Earl of Inchiquin (1700–1777), founder of the Royal Cork Yacht Club in 1720
William O'Brien, 2nd Marquess of Thomond (1765–1846), Irish peer
William O'Brien (actor) Irish actor in the company of David Garrick at Drury Lane
Bill O'Brien (actor), Director of Theatre and Musical Theatre for the National Endowment for the Arts; actor
Tim O'Brien (author) (William Timothy O'Brien, born 1946), American author
Billy Porter (criminal) (William O'Brien, 1850–?), American burglar and underworld figure in New York City
William O'Brien (Royal Navy officer) (1916–2016), British admiral
William O'Brien (police officer) (1944-2016)