Seán O'Brien (rugby player)
|O'Brien playing for Leinster against Leicester Tigers.|
|Full name||Seán Kevin O'Brien|
|Date of birth||14 February 1987|
|Place of birth||Carlow, Republic of Ireland|
|Height||1.88 m (6 ft 2 in)|
|Weight||108 kilograms (17.0 st)|
|School||Tullow Community School|
|University||University College Dublin|
|Rugby union career|
|Position(s)||Flanker / No.8|
|Position||Flanker / No.8|
|Years||Club / team|
University College Dublin RFC
|Professional / senior clubs|
|Years||Club / team||Caps||(points)|
|correct as of 4 February 2014.|
|Years||Club / team||Caps||(points)|
British and Irish Lions
|correct as of 24 November 2013.|
He is known for his barging runs and ball carrying, with the IRB's Rugby News Service describing him as 'a rampaging ball of destruction  He is also known for his speed, counter rucking, and defensive tackling.
O’Brien made his Leinster debut against Cardiff Blues in September 2008 in the Celtic League. He made his Heineken Cup debut against Castres Olympique in December 2008. He did not feature for Leinster in the 2009 Heineken Cup Final, but evidence of O’Brien’s emergence as one of the most exciting young back-row forwards in Europe came in the form of strong interest from France before Christmas of 2010. The Irish Rugby Football Union, keen to ensure they did not lose "The Tullow Tank", moved quickly and O’Brien agreed a new three-year deal with Leinster the following January. O'Brien was in outstanding form for Leinster during the pool stages of the 2010–11 Heineken Cup, and he was an integral part of the team that beat Northampton Saints to win the 2011 Heineken Cup Final. In January 2014, O'Brien signed a new two year deal with Leinster.
In 2007. he was a member of the Ireland Under-20 Grand Slam winning squad. O'Brien was called up to the Ireland team for the 2009 November Tests, and he gained his first cap when he came on as a substitute against Fiji at the RDS Arena on 21 November 2009. He also came on as a replacement against South Africa in a 15–10 win on 28 November 2009. He came off the bench against Italy in the 2010 Six Nations Championship, but was dropped afterwards. He was injured during Ireland's 2010 Summer Tests, but won his first start against Samoa in the 2010 Autumn Tests, though he did not feature in any other games. O'Brien started every game for Ireland during the 2011 Six Nations, winning the Man of the Match award against Italy. He came third in the 2011 Six Nations Player of the Championship losing out to the winner Andrea Masi. He was selected in Ireland's final 30-man squad for the 2011 Rugby World Cup in New Zealand. O'Brien started against Australia, Russia, Italy and Wales during Ireland's World Cup campaign, scoring a try against Russia and winning the Man-of-the-Match award against Italy.
On 25 May 2011, O'Brien was named ERC European Player of the Year following a season where Leinster were Heineken Cup champions. He was one of five players shortlisted from the 24 Heineken Cup and 20 Amlin Challenge Cup teams that included Leinster teammates Jamie Heaslip, Isa Nacewa, as well as, Stade Français' Sergio Parisse, and Northampton Saints' Soane Tonga'uiha.
On 4 October 2011, O'Brien was named as the 'Player of Pool C' by the IRB.
On 24 October 2011, the official Rugby World Cup website named O'Brien one of the tournament's 'Top Five Star Players.' 
- (Rugby News Service. "Player of Pool C: Ireland's Sean O'Brien". www.rugbyworldcup.com. Retrieved 2012-08-21.
- "Sean O'Brien fends off France and signs two-year Leinster contract". Irish Independent. 16 January 2014. Retrieved 16 January 2014.
- "Ireland 41–6 Fiji". RTÉ Sport. 21 November 2009. Retrieved 26 November 2009.
- "Ireland 15–10 South Africa". BBC Sport. 28 November 2009. Retrieved 2 December 2009.
- "Masi scoops Six Nations award". ESPN Scrum. 2011-03-23. Retrieved 2011-03-23.
- Kitson, Robert (25 May 2011). "Sean O'Brien of Leinster named European Player of the Year". Guardian (London). Retrieved 25 May 2011.
- "Sean O'Brien lands ERC accolade". RTÉ News. 2011-05-25. Retrieved 2011-05-25.
- "O'Brien named writers' Player of the Year". RTE Sport. 2011-08-15. Retrieved 2011-08-15.
- "Team of the Rugby World Cup". Sydney Morning Herald. Fairfax. Retrieved 2012-08-21.
- "Top five players of RWC 2011". www.rugbyworldcup.com. Retrieved 2012-08-21.