Dough Castle (originally Dumhach Ui Chonchuir) is a ruined castle at Lahinch in County Clare, western Ireland. It was built by the O'Connors in 1306 and in 1584 it was held by the family of Sir Donal O'Brien. In 1654, Cromwellian officer Colonel Stubber saved the castle from demolition, and in 1675 the castle still had the full tower with a two-storey house attached. Due to poor foundations on sand, it collapsed several times and today it is in ruins, with little more than part of the O'Brien tower remaining on Lahinch Golf Course near where the Dealagh joins the Inagh River. There was another castle in the vicinity, O'Brien's Castle, built by Turlough O'Brien of the O'Brien clan in 1588 to defend against the Spanish, but nothing remains of this fortress.
Coordinates: 52°57′4″N 9°21′2″W / 52.95111°N 9.35056°W / 52.95111; -9.35056
The O'Brien dynasty were a royal dynasty who ruled Thomond, Ireland.
O'Brien is a common surname. See List of people named O'Brien.
O'Brien may also refer to:
O'Brien is a British talk show presented by James O'Brien. It was broadcast on ITV from 30 March 2015 to 10 April 2015.
The majority has been negative with Gerard O'Donovan of The Daily Telegraph describing the show as "low rent" and "disappointing".
O'Brien is a surname of Irish origin which has many variants in the Irish diaspora worldwide, such as O'Bryan, O'Brian, O'Briant, O'Brient, O'Bryant, O'Brine, O'Bryen etc., which all claim a general common ancestry with the original Gaelic surname being Ó Briain or Uí Briain. Notable people with the surname include: