{{wiktionary|O'Brien}}
'''O'Brien''' may refer to: {{tocright}}
==People== * O'Brien (surname), an Irish surname * O'Brien dynasty, 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 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.
==See also== * Brien * O'Brian, a surname (including a list of people with the name) * O'Bryan (born 1961), American singer-songwriter * Justice O'Brien (disambiguation) * {{in title|O'Brien}} {{Disambiguation|geo}} {{DEFAULTSORT:Obrien}}