Niall John O'Brien (born 8 November 1981) is a former Irish cricketer and a cricket commentator. He is a left-handed batsman and wicket-keeper. Domestically O'Brien began his professional career with Kent in 2004 before joining Northamptonshire at the start of 2007, spending six seasons there before joining Leicestershire for 2013.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| Test | 1 | 18 | 9.00 | 0/0 | 18 | – | – | – | 2/0 |
| ODI | 103 | 2,581 | 28.05 | 1/18 | 109 | – | – | – | 90/14 |
| T20I | 30 | 466 | 17.92 | 0/1 | 50 | – | – | – | 17/10 |
| FC | 176 | 9,057 | 35.51 | 15/48 | 182 | 2 | 9.50 | 1/4 | 492/48 |
