O'Brien

O'Brien may refer to:

People

 * O'Brien (surname), an Irish surname
 * O'Brien dynasty, a powerful Irish dynasty that ruled Munster and produced several High Kings of Ireland

United States

 * O'Brien, California, an unincorporated community in Shasta County
 * O'Brien, Florida, an unincorporated community in Suwannee County
 * O'Brien, Oregon, a census-designated place and unincorporated community in Josephine County
 * O'Brien, Texas, a city in Haskell County
 * O'Brien, West Virginia, an unincorporated community in Barbour County
 * O'Brien County, Iowa, a county

Other places

 * O'Brien, Argentina, a town in Buenos Aires Province, Argentina
 * O'Briens Hill, Queensland, a locality in the Cassowary Coast Region, Australia
 * O'Brien Island, in the South Shetland Islands, Antarctica
 * O'Brien Island, Chile, in the Magallanes Region, Chile

Ships

 * USS O'Brien, a list of ships with this name
 * Capitan O'Brien-class submarine three submarines built for the Chilean Navy in 1928–1929
 * Oberon-class submarine (also known as O'Brien-class submarine), Chilean Navy submarine class
 * Chilean submarine O'Brien (S22), an Oberon-class sub

Other uses

 * O'Brien (Nineteen Eighty-Four), the main antagonist in George Orwell's novel
 * O'Brien (TV series), a British talk show presented by James O'Brien
 * United States v. O'Brien, legal case ruled on by the US Supreme Court regarding draft card burning and the First Amendment's guarantee of free speech
 * O'Briens Irish Sandwich Bars, a café chain based in Ireland
 * O'Brien AutoGlass, the Australian subsidiary of Belron.