O’Sheas
- 70 Rostrevor Street, Hamilton, Waikato
The Osteopathic Council of New Zealand
- Level 3, Freemason House, 195-201 Willis Street, Wellington
NZ Ostrich Association
- 95 Rakaia Barrhill Methven Road, Rakaia,
Dunstan Hospital
- Hospital St, Clyde, Otago
Otago Finance Ltd
- 140 George Street, Dunedin
Otago Peninsula Trust
- 430 Portobello Road, Dunedin
Otahuna Horse Riding
- Otahuna Road, Tai Tapu, New Zealand
Otaki School
- Mill Road, Otaki
Otaki First National
- 238 SH1, Otaki
Otakiri Springs Limited
- Johnson Rd, Otakiri, Whakatane
Otamatea High School
- Bickerstaffe Road, Maungaturoto
Otautau School
- Elles Road, Otautau