O'Brien may refer to:

People

O'Brien (surname) O'Brien is a surname of Ireland, Irish origin. It has many variants in the Irish diaspora worldwide, such as Brien, O'Bryan, O'Brian, Brian, O'Brine and O'Bryen which all ''claim'' a O'Brien dynasty, general common ancestry. The original Goidelic ...

, an Irish surname *

O'Brien dynasty The O'Brien dynasty (; ; genitive ''Uí Bhriain'' ) was an Irish Clan and noble house of Munster, founded in the 10th century by Brian Boru of the Dál gCais (Dalcassians). After becoming King of Munster, through conquest he established hims ...

, a powerful Irish dynasty that ruled Munster and produced several High Kings of Ireland

Places

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 O'Brien County is a County (United States), county in the U.S. state of Iowa. As of the 2020 United States census, the population was 14,182. The county seat is Primghar, Iowa, Primghar. History By the time Iowa attained statehood (December 28 ...

, 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 O'Brien Island is a small rocky island in the South Shetland Islands of Antarctica. It lies south-west of Aspland Island and rises to 540 m. A strong marine channel, named Tasman Rip, runs between O'Brien Island and Eadie Island. The ...

, in the South Shetland Islands, Antarctica *

O'Brien Island, Chile OBrien Island ({{Langx, es, Isla O'Brien) is located at the western end of the Beagle Channel. East of the island is the ''Paso Darwin'', that is the beginning of the Beagle Channel. To the north is the Isla Grande de Tierra del Fuego, separat ...

, 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 ''United States v. O'Brien'', 391 U.S. 367 (1968), was a List of landmark court decisions in the United States, landmark decision of the United States Supreme Court, ruling that a criminal prohibition against Draft-card burning, burning a draft c ...

'', 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 O'Briens Irish Sandwich Cafe, also known as O'Briens, is an Irish franchise sandwich cafe chain founded in Ireland in 1988 by Brody Sweeney. As of October 2009, O'Briens was operated by the AIL Group, who owns Abrakebabra. Foundations In 1988 ...

, a café chain based in Ireland * O'Brien AutoGlass, the Australian subsidiary of