| ORGANIC INITIATIVE LIMITED | Registered | NZ Limited Company | 5595738 | government contract suppliers |
| Organization for Mine Clearance and Afghan Rehabilitation (OMAR) | Unknown | - | - | government contract suppliers |
| ORIENT CONSTRUCTION LIMITED | Registered | NZ Limited Company | 4552319 | political donors |
| ORIGIN CONSULTANTS LIMITED | Registered | NZ Limited Company | 3183805 | government contract suppliers |
| Origin Medical Recruitment | Registered | Sole Trader | - | government contract suppliers |
| Orikan New Zealand Ltd | Unknown | - | - | government contract suppliers |
| Orion Customer Service Panel | Unknown | - | - | councillor interest |
| ORIWA ENTERPRISES LIMITED | Registered | - | - | |
| ORIWA LIMITED | Removed | - | - | |
| ORIX NEW ZEALAND LIMITED | Registered | NZ Limited Company | 409889 | government contract suppliers |
| ORL HEALTH LIMITED | Registered | NZ Limited Company | 2071581 | |
| ORMISTON HOSPITAL LIMITED | Registered | NZ Limited Company | 1988422 | government contract suppliers |
| ORMISTON SURGICAL & ENDOSCOPY LIMITED | Registered | NZ Limited Company | 1853241 | government contract suppliers |
| ORONGOMAI MARAE ASSET HOLDING COMPANY LIMITED | Removed | NZ Limited Company | 1965920 | councillor interest |
| Orongomai Marae Community Centre Trust | Registered | Charitable Trust | - | government contract suppliers |
| Orphan Terrace Limited | Unknown | - | - | councillor interest |
| ORRS KAIKOHE PHARMACIES LIMITED | Registered | NZ Limited Company | 4257058 | government contract suppliers |
| ORTHO MEDICS LIMITED | Registered | NZ Limited Company | 101274 | government contract suppliers |
| ORTHO-CLINICAL DIAGNOSTICS AUSTRALIA PTY LTD. | Registered | Overseas ASIC Company | 5977976 | government contract suppliers |
| Orthomed NZ Ltd | Unknown | - | - | government contract suppliers |
| ORTHOPAEDIC SERVICES LIMITED | Registered | NZ Limited Company | 1534618 | government contract suppliers |
| ORTHOTECH ORTHOPAEDICS (NZ) LIMITED | Registered | NZ Limited Company | 1227512 | government contract suppliers |
| Oruaiti 2B2 Trust | Unknown | - | - | mp interest |
| OSF Digital | Registered | NZ Limited Company | - | government contract suppliers |
| Oshkosh Airport Products LLC | Unknown | - | - | government contract suppliers |
| OSIA ENTERPRISE LIMITED | Registered | NZ Limited Company | 496313 | government contract suppliers |
| Osmium Partners LLC | Unknown | - | - | fund managers |
| OSPREY BOATS NZ LIMITED | Registered | NZ Limited Company | 3244348 | government contract suppliers |
| Ospreyt Boats Ltd. | Unknown | - | - | government contract suppliers |
| OSSIS CORPORATION | Registered | NZ Unlimited Company | 911995 | government contract suppliers |
| OSTERLEY WAY INVESTMENTS LIMITED | Registered | NZ Limited Company | 5627946 | mp interest |
| Osterly Way Investments Limited | Unknown | - | - | mp interest |
| Ostlers Garden Trust | Unknown | - | - | councillor interest |
| OTAGO BUSINESS EQUIPMENT (1992) LIMITED | Removed | NZ Limited Company | 534584 | government contract suppliers |
| OTAGO GAS SERVICES LIMITED | Registered | - | - | |
| Otago Housing Alliance | Unknown | - | - | councillor interest |
| Otago Mental Health Support Trust | Registered | Charitable Trust | - | government contract suppliers |
| OTAGO MOTORHOME CENTRE LIMITED | Registered | - | - | |
| OTAGO MUSEUM NOMINEE LIMITED | Removed | NZ Limited Company | 1847818 | kanoa recipients |
| OTAGO PELLET FIRES LIMITED | Registered | NZ Limited Company | 1912749 | government contract suppliers |
| OTAGO PEST SERVICES LIMITED | Registered | NZ Limited Company | 1947871 | government contract suppliers |
| Otago Polytechnic | Registered | - | - | |
| OTAGO PSYCHOLOGY LIMITED | Registered | NZ Limited Company | 7885463 | government contract suppliers |
| Otago Realty Holdings Limited | Unknown | - | - | government contract suppliers |
| OTAGO ROCK LOBSTER INDUSTRY ASSOCIATION INCORPORATED | Registered | - | - | |
| Otago South River Care | Registered | Incorporated Society | - | councillor interest |
| Otago Southland Regional Road Authority | Unknown | - | - | councillor interest |
| Otago University | Unknown | - | - | government contract supplierscorporate donations |
| Otago Vacuum Tank Services Ltd | Unknown | - | - | government contract suppliers |
| Otaihanga Investment Trust | Unknown | - | - | councillor interest |
