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| Full name: | Kevin Joseph O'Brien |
| Born: | 4th March 1984, Dublin, Ireland |
| Batting: | Right-hand batsman |
| 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: 2006-2012); Ireland (World Cup: 2006/07-2010/11); Ireland (Int Twenty20: 2008-2012/13); Ireland (Twenty20 World Cup: 2009-2012/13); Ireland (Main FC: 2006/07-2012/13); Nottinghamshire (Main FC: 2009); Ireland (Main ListA: 2006-2012/13); Nottinghamshire (Main ListA: 2009); Gloucestershire (Main ListA: 2011); Ireland (Main Twenty20: 2008-2012/13); Nottinghamshire (Main Twenty20: 2009); Gloucestershire (Main Twenty20: 2011); Somerset (Main Twenty20: 2012); Rangpur Riders (Main Twenty20: 2012/13); Ireland A (Other ListA: 2006); Ireland Under-19s (Under-19 ODI: 2003/04); Ireland Under-19s (Under-19 limited overs: 2003/04); All teams |
| Walter Lawrence Trophy winner: 2011 | |
| Lists of matches and more detailed statistics | |

| First-Class Career Batting and Fielding (2006/07-2012/13) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 25 | 33 | 3 | 980 | 171* | 32.66 | 1 | 7 | 60.56 | 20 | |
| First-Class Career Bowling (2006/07-2012/13) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Overall | 1397 | 60 | 668 | 25 | 5-39 | 26.72 | 1 | 0 | 55.88 | 2.86 |
| ODI Career Batting and Fielding (2006-2012) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland | 68 | 62 | 9 | 1749 | 142 | 33.00 | 2 | 7 | 80.71 | 30 | |
| ODI Career Bowling (2006-2011/12) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Ireland | 1834 | 19 | 1502 | 49 | 4-71 | 30.65 | 1 | 0 | 37.42 | 4.91 |
| List A Career Batting and Fielding (2006-2012/13) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 125 | 115 | 20 | 2889 | 142 | 30.41 | 3 | 11 | 80.07 | 53 | |
| List A Career Bowling (2006-2012) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Overall | 3320 | 33 | 2890 | 81 | 4-31 | 35.67 | 2 | 0 | 40.98 | 5.22 |
| International Twenty20 Career Batting and Fielding (2008-2012/13) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Ireland | 30 | 26 | 5 | 271 | 39* | 12.90 | 0 | 0 | 104.23 | 11 | |
| International Twenty20 Career Bowling (2008-2012/13) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Ireland | 363 | 0 | 423 | 19 | 3-35 | 22.26 | 0 | 0 | 19.10 | 6.99 |
| Twenty20 Career Batting and Fielding (2008-2012/13) | |||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | SRate | Ct | ||
| Overall | 79 | 69 | 15 | 1044 | 119 | 19.33 | 1 | 1 | 130.82 | 27 | |
| Twenty20 Career Bowling (2008-2012/13) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Overall | 902 | 1 | 1122 | 44 | 3-17 | 25.50 | 0 | 0 | 20.50 | 7.46 |
| 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 |