- Full Name: Heritier O'Brien
- DOB: 15/11/1986
- Place of birth: Rio de Janeiro,Brazil
- Original Team: Claremont
- Draft: #20 2005 Rookie Draft, Collingwood
- Height/Weight: 188/91
- Position(s): Defender
Following representing Western Australia at the National U18 Championships OBrien was not selected in the National Draft. Determined to play AFL he called Collingwoods football department and offered to pay his own way for a chance to train with the squad prior to the Rookie draft. This determination paid off as he was selected with pick 20 in the Rookie Draft. Known for his long runs off half back OBrien has become a favourite of Collingwood supports. A member of the 2010 premiership side and All-Australian team.