| Full name: | Kevin Joseph O'Brien |
| Born: | 4th March 1984, Dublin, Ireland |
| Batting: | Right-hand batter |
| Bowling: | Right-arm medium-fast |
| Education: | Marian College, Dublin; Tallaght Institute of Technology |
| Relations: | Brother: NJ O'Brien; Father: BA O'Brien |
| Teams: | Ireland (ODI: 2006-2021); Ireland (International Twenty20: 2008-2021/22); Ireland (Test: 2018-2019); Nottinghamshire (Main Twenty20: 2009); Nottinghamshire (Main FC: 2009); Nottinghamshire (Main ListA: 2009); Gloucestershire (Main ListA: 2011); Gloucestershire (Main Twenty20: 2011); Somerset (Main Twenty20: 2012); Rangpur Riders (Main Twenty20: 2012/13); Surrey (Main Twenty20: 2013-2014); Trinidad and Tobago Red Steel (Main Twenty20: 2013-2014); Surrey (Main FC: 2014); Northern Districts (Main Twenty20: 2014/15-2015/16); Leicestershire (Main Twenty20: 2015-2016); Leicestershire (Main ListA: 2016); Leinster Lightning (Main ListA: 2017-2021); Leinster Lightning (Main Twenty20: 2017-2021); Leinster Lightning (Main FC: 2017-2019); Kandahar Kings (Main Twenty20: 2018/19); Munster Reds (Main ListA: 2022); Munster Reds (Main Twenty20: 2022); Ireland Under-19s (Under-19 ODI: 2003/04); All teams |
| Walter Lawrence Trophy winner: 2011 | |
| Lists of matches and more detailed statistics | |
| Test Career Batting and Fielding (2018-2019) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland | 3 | 6 | 1 | 258 | 118 | 51.60 | 1 | 1 | 55.24 | 0 | |
| Test Career Bowling (2018-2019) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Ireland | 60 | 2 | 31 | 0 | 0-11 | 3.10 | ||||
| ODI Career Batting and Fielding (2006-2021) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland | 153 | 141 | 18 | 3619 | 142 | 29.42 | 2 | 18 | 88.80 | 67 | |
| ODI Career Bowling (2006-2021) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Ireland | 4296 | 30 | 3727 | 114 | 4-13 | 32.69 | 5 | 0 | 37.68 | 5.20 |
| International Twenty20 Career Batting and Fielding (2008-2021/22) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland | 110 | 103 | 10 | 1973 | 124 | 21.21 | 1 | 5 | 130.92 | 40 | |
| International Twenty20 Career Bowling (2008-2021/22) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Ireland | 917 | 0 | 1149 | 58 | 4-45 | 19.81 | 1 | 0 | 15.81 | 7.51 |
| First-Class Career Batting and Fielding (2006/07-2019) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 47 | 66 | 11 | 2039 | 171* | 37.07 | 2 | 14 | 61.32 | 37 | |
| First-Class Career Bowling (2006/07-2019) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Overall | 2745 | 116 | 1304 | 47 | 5-39 | 27.74 | 1 | 0 | 58.40 | 2.85 |
| List A Career Batting and Fielding (2006-2022) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 247 | 228 | 35 | 5689 | 142 | 29.47 | 3 | 28 | 87.49 | 103 | |
| List A Career Bowling (2006-2022) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Overall | 6377 | 49 | 5595 | 170 | 4-13 | 32.91 | 7 | 0 | 37.51 | 5.26 |
| Twenty20 Career Batting and Fielding (2008-2022) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 258 | 239 | 32 | 4577 | 124 | 22.11 | 2 | 15 | 134.45 | 94 | |
| Twenty20 Career Bowling (2008-2022) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Overall | 2107 | 1 | 2688 | 121 | 4-22 | 22.21 | 2 | 0 | 17.41 | 7.65 |
| Under-19 ODI Career Batting and Fielding (2003/04) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland Under-19s | 7 | 7 | 0 | 241 | 95 | 34.42 | 0 | 3 | 74.15 | 3 | |
| Under-19 ODI Career Bowling (2003/04) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Ireland Under-19s | 210 | 1 | 216 | 4 | 2-70 | 54.00 | 0 | 0 | 52.50 | 6.17 |
| Bangladesh Premier League Career Batting and Fielding (2012/13) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Rangpur Riders | 11 | 10 | 3 | 131 | 30 | 18.71 | 0 | 0 | 124.76 | 3 | |
| Bangladesh Premier League Career Bowling (2012/13) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Rangpur Riders | 216 | 1 | 254 | 12 | 3-17 | 21.16 | 0 | 0 | 18.00 | 7.05 |
| Caribbean Premier League Career Batting and Fielding (2013-2014) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Trinidad and Tobago Red Steel | 18 | 17 | 2 | 376 | 90* | 25.06 | 0 | 3 | 122.87 | 8 | |
| Caribbean Premier League Career Bowling (2013-2014) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Trinidad and Tobago Red Steel | 72 | 0 | 95 | 9 | 4-22 | 10.55 | 1 | 0 | 8.00 | 7.91 |
| Twenty20 Blast Career Batting and Fielding (2009-2016) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 54 | 46 | 9 | 886 | 119 | 23.94 | 1 | 2 | 139.52 | 23 | |
| Twenty20 Blast Career Bowling (2009-2016) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Overall | 518 | 0 | 700 | 23 | 3-27 | 30.43 | 0 | 0 | 22.52 | 8.10 |
| Super Smash Career Batting and Fielding (2014/15-2015/16) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Northern Districts | 11 | 11 | 1 | 218 | 52 | 21.80 | 0 | 1 | 140.64 | 3 | |
| Super Smash Career Bowling (2014/15-2015/16) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Northern Districts | 72 | 0 | 118 | 1 | 1-25 | 118.00 | 0 | 0 | 72.00 | 9.83 |