Office of the Ombudsmen
- Level 10, Forsyth Barr Tower, 55-65 Shortland Street, Auckland
OM Financial Ltd
- Level 2, 187 Broadway, Newmarket, Auckland
Omnicron Productions Ltd
- Top Floor, 10 Galatos Street, Newton, Auckland
Onduline Building Products
- 8C Marphona Cresent, Takanini,
Onehunga Primary School
- 122 Arthur Street, Onehunga, Auckland
Onepoto School
- 17 Fraser Avenue, Northcote, Auckland
Onyx Group Ltd
- 17 The Concourse, Henderson, Auckland
Optik Eyecare Newmarket
- 2a Gillies Avenue, Newmarket, Auckland
Opra Consulting Group Queens Arcade
- Level 3, Suite 302, Queens Arcade, 34-40 Queen Street, Auckland
Optik Eyecare Pukekohe
- 20 Hall Street, Pukekohe
Optimism
- Level 1, 1 Kingdon Street, Newmarket, Auckland
The Optimum Clothing Co. Ltd
- 14 Westech Place, Kelston, Auckland