ODI Batting and Fielding in Each Season by Kevin O'Brien
| Season | | Matches | Inns | Not Out | Runs | HS | Ave | 100 | 50 | Ct | St |
| 2006 | (Ireland) | 1 | 1 | 0 | 35 | 35 | 35.00 | 0 | 0 | 2 | |
| 2006 | (Scotland) | 1 | 1 | 0 | 24 | 24 | 24.00 | 0 | 0 | 0 | |
| 2006-07 | (Kenya) | 5 | 5 | 0 | 264 | 142 | 52.80 | 1 | 2 | 3 | |
| 2006-07 | (West Indies) | 8 | 8 | 1 | 170 | 49 | 24.28 | 0 | 0 | 1 | |
| 2007 | (Ireland) | 5 | 5 | 0 | 80 | 34 | 16.00 | 0 | 0 | 3 | |
| 2007-08 | (Bangladesh) | 3 | 3 | 0 | 59 | 21 | 19.66 | 0 | 0 | 1 | |
| 2008 | (Ireland) | 2 | 1 | 1 | 10 | 10* | | 0 | 0 | 1 | |
| 2008-09 | (South Africa) | 3 | 1 | 1 | 89 | 89* | | 0 | 1 | 2 | |
| 2008-09 | (Kenya) | 2 | 2 | 0 | 121 | 83 | 60.50 | 0 | 1 | 2 | |
| 2009 | (Ireland) | 4 | 3 | 0 | 31 | 16 | 10.33 | 0 | 0 | 2 | |
| 2009 | (Scotland) | 1 | 1 | 0 | 1 | 1 | 1.00 | 0 | 0 | 1 | |
| 2009-10 | (West Indies) | 1 | 1 | 0 | 54 | 54 | 54.00 | 0 | 1 | 0 | |
| 2010 | (Canada) | 2 | 2 | 0 | 10 | 7 | 5.00 | 0 | 0 | 0 | |
| 2010 | (Ireland) | 5 | 4 | 1 | 53 | 26 | 17.66 | 0 | 0 | 0 | |
| 2010 | (Netherlands) | 6 | 6 | 3 | 226 | 98* | 75.33 | 0 | 1 | 4 | |
| 2010-11 | (India) | 5 | 5 | 1 | 161 | 113 | 40.25 | 1 | 0 | 3 | |
| 2010-11 | (Zimbabwe) | 3 | 3 | 1 | 109 | 73* | 54.50 | 0 | 1 | 0 | |
| 2010-11 | (Bangladesh) | 1 | 1 | 0 | 37 | 37 | 37.00 | 0 | 0 | 0 | |
| 2011 | (Ireland) | 5 | 5 | 0 | 126 | 43 | 25.20 | 0 | 0 | 5 | |
| 2011 | (Scotland) | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 | 0 | 0 | |
| 2011-12 | (Kenya) | 2 | 2 | 0 | 58 | 39 | 29.00 | 0 | 0 | 0 | |
| 2012 | (Ireland) | 2 | 1 | 0 | 31 | 31 | 31.00 | 0 | 0 | 0 | |
| 2013 | (Ireland) | 5 | 4 | 1 | 148 | 84* | 49.33 | 0 | 1 | 4 | |
| 2013 | (Netherlands) | 2 | 2 | 0 | 36 | 32 | 18.00 | 0 | 0 | 1 | |
| 2013-14 | (West Indies) | 1 | 1 | 0 | 22 | 22 | 22.00 | 0 | 0 | 0 | |
| 2014 | (Ireland) | 4 | 4 | 1 | 159 | 67 | 53.00 | 0 | 2 | 2 | |
| 2014-15 | (United Arab Emirates) | 4 | 3 | 0 | 64 | 30 | 21.33 | 0 | 0 | 2 | |
| 2014-15 | (Australia) | 4 | 4 | 0 | 130 | 50 | 32.50 | 0 | 1 | 2 | |
| 2014-15 | (New Zealand) | 2 | 2 | 0 | 1 | 1 | 0.50 | 0 | 0 | 1 | |
| 2015 | (Ireland) | 1 | 0 | | | | | | | 0 | |
| 2015-16 | (Zimbabwe) | 3 | 3 | 0 | 31 | 16 | 10.33 | 0 | 0 | 1 | |
| 2016 | (Ireland) | 7 | 7 | 0 | 225 | 75 | 32.14 | 0 | 2 | 2 | |
| 2016-17 | (India) | 2 | 2 | 1 | 85 | 72* | 85.00 | 0 | 1 | 0 | |
| 2016-17 | (South Africa) | 2 | 2 | 0 | 64 | 41 | 32.00 | 0 | 0 | 0 | |
| 2016-17 | (United Arab Emirates) | 2 | 1 | 0 | 69 | 69 | 69.00 | 0 | 1 | 2 | |
| 2017 | (Ireland) | 3 | 2 | 0 | 11 | 10 | 5.50 | 0 | 0 | 1 | |
| 2017 | (England) | 2 | 2 | 0 | 22 | 18 | 11.00 | 0 | 0 | 2 | |
| 2017-18 | (United Arab Emirates) | 7 | 7 | 2 | 116 | 46 | 23.20 | 0 | 0 | 3 | |
| 2017-18 | (Zimbabwe) | 6 | 6 | 1 | 194 | 50* | 38.80 | 0 | 1 | 0 | |
| 2018 | (Ireland) | 3 | 3 | 0 | 46 | 22 | 15.33 | 0 | 0 | 2 | |
| 2018-19 | (India) | 5 | 4 | 1 | 90 | 33* | 30.00 | 0 | 0 | 2 | |
| 2019 | (Ireland) | 9 | 9 | 1 | 228 | 68 | 28.50 | 0 | 2 | 6 | |
| 2019-20 | (West Indies) | 3 | 3 | 0 | 56 | 31 | 18.66 | 0 | 0 | 1 | |
| 2020 | (England) | 3 | 3 | 1 | 46 | 22 | 23.00 | 0 | 0 | 0 | |
| 2020-21 | (United Arab Emirates) | 4 | 4 | 0 | 27 | 23 | 6.75 | 0 | 0 | 3 | |
| 2021 | (Netherlands) | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 | 0 | 0 | |