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| Full name: | Niall John O'Brien | 
| Born: | 8th November 1981, Dublin, Ireland | 
| Batting: | Left-hand batter | 
| Wicket-keeper | |
| Education: | Marian College, Dublin | 
| Relations: | Brother: KJ O'Brien; Father: BA O'Brien | 
| Teams: | Ireland (ODI: 2006-2018); Ireland (International Twenty20: 2008-2015/16); Ireland (Test: 2018); Kent (Main FC: 2004-2006); Kent (Main ListA: 2004-2006); Kent (Main Twenty20: 2004-2006); Northamptonshire (Main FC: 2007-2012); Northamptonshire (Main ListA: 2007-2012); Northamptonshire (Main Twenty20: 2008-2012); Khulna Royal Bengals (Main Twenty20: 2011/12); Rangpur Riders (Main Twenty20: 2012/13); Leicestershire (Main FC: 2013-2016); Leicestershire (Main ListA: 2013-2016); Leicestershire (Main Twenty20: 2013-2016); North West Warriors (Main ListA: 2017-2018); North West Warriors (Main FC: 2017-2018); Ireland Under-19s (Under-19 ODI: 1999/00); All teams  | 
| Northamptonshire cap: 2011 | |
| Lists of matches and more detailed statistics | |
| Articles: | We will give our best against India: Niall O’Brien | 
| Brothers O’Brien take Ireland to next stage | |
| Battling Ireland lose to South Africa | |
| Pictures: | Niall O'Brien takes the catch as Gary Wilson and William Porterfield look on | 
| Niall O'Brien and John Mooney | |
| Niall O'Brien celebrates a try | |
| Niall O'Brien shouts out instructions | |
| List of all pictures | |

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| Test Career Batting and Fielding (2018) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland | 1 | 2 | 0 | 18 | 18 | 9.00 | 0 | 0 | 32.72 | 2 | |
| ODI Career Batting and Fielding (2006-2018) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Ireland | 103 | 101 | 9 | 2581 | 109 | 28.05 | 1 | 18 | 70.94 | 90 | 14 | 
| International Twenty20 Career Batting and Fielding (2008-2015/16) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Ireland | 30 | 28 | 2 | 466 | 50 | 17.92 | 0 | 1 | 98.10 | 17 | 10 | 
| First-Class Career Batting and Fielding (2004-2018) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Overall | 176 | 283 | 28 | 9057 | 182 | 35.51 | 15 | 48 | 55.32 | 492 | 48 | 
| First-Class Career Bowling (2004-2018) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Overall | 18 | 0 | 19 | 2 | 1-4 | 9.50 | 0 | 0 | 9.00 | 6.33 | 
| List A Career Batting and Fielding (2002-2018) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Overall | 238 | 214 | 26 | 5700 | 121 | 30.31 | 4 | 36 | 77.40 | 210 | 44 | 
| Twenty20 Career Batting and Fielding (2004-2016) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Overall | 147 | 127 | 18 | 2329 | 84 | 21.36 | 0 | 5 | 111.32 | 82 | 35 | 
| Under-19 ODI Career Batting and Fielding (1999/00) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland Under-19s | 5 | 5 | 0 | 76 | 36 | 15.20 | 0 | 0 | 34.86 | 0 | |
| Bangladesh Premier League Career Batting and Fielding (2011/12-2012/13) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Overall | 12 | 9 | 1 | 145 | 40* | 18.12 | 0 | 0 | 102.83 | 6 | 3 | 
| Twenty20 Blast Career Batting and Fielding (2004-2016) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | St | |
| Overall | 91 | 77 | 14 | 1329 | 69 | 21.09 | 0 | 1 | 115.36 | 54 | 21 | 
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