Teams Iain O'Brien played for
| Test | New Zealand (2004/05-2009/10) |
| ODI | New Zealand (2007/08-2008/09) |
| International Twenty20 | New Zealand (2008/09-2009) |
| Main FC | Wellington (2000/01-2009/10) |
| Leicestershire (2009) | |
| Middlesex (2010) | |
| Main ListA | Wellington (2003/04-2009/10) |
| Leicestershire (2009) | |
| Middlesex (2010) | |
| Main Twenty20 | Wellington (2006/07-2008/09) |
| Leicestershire (2009) | |
| Middlesex (2010) | |
| Other FC | New Zealand (2004/05-2009/10) |
| New Zealand A (2005/06-2008/09) | |
| New Zealanders (2007/08-2009) | |
| Major Association XI (2007/08) | |
| Other ListA | New Zealand A (2005/06) |
| New Zealand (2007/08-2008/09) | |
| Other Twenty20 | New Zealand (2008/09-2009) |
| Second Eleven Championship | Worcestershire Second XI (2008) |
| Middlesex Second XI (2010) | |
| Liverpool Premier League | New Brighton (2007) |
| New Zealand Provincial A Tournament | Wellington A (2000/01-2002/03) |
| Twenty20 World Cup | New Zealand (2009) |
| Twenty20 Blast | Leicestershire (2009) |
| Middlesex (2010) | |
| Super Smash | Wellington (2006/07-2008/09) |
| County Championship | Leicestershire (2009) |
| Middlesex (2010) | |
| Plunket Shield | Wellington (2000/01-2009/10) |
| Miscellaneous | New Zealand Universities (1997/98) |
| Wellington (2004/05-2006/07) | |
| New Zealand A (2005/06) | |
| Wellington XI (2006/07) | |
| New Zealand Emerging Players (2007) | |
| New Zealanders (2007/08-2008/09) | |
| New Zealand XI (2007/08) | |
| New Zealand Invitation XI (2007/08-2009/10) | |
| New Zealand (2009) | |
| Lashings World XI (2014) | |
| Hardy's International XI (2014) | |
| Rest of the World XI (2018) |
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