| OPOTIKI MARINA AND INDUSTRIAL PARK LIMITED | Registered | NZ Limited Company | 7763036 | kanoa recipients |
| OPPORTUNE CONSULTING LIMITED | Registered | NZ Limited Company | 7315576 | government contract suppliers |
| OPRA Consulting | Unknown | - | - | government contract suppliers |
| OPRITECH (NZ) LIMITED | Registered | NZ Limited Company | 8129798 | government contract suppliers |
| OPSEC SOLUTIONS LIMITED | Registered | NZ Limited Company | 1754698 | government contract suppliers |
| OPTIC SECURITY 3 LIMITED | Registered | NZ Limited Company | 6495732 | government contract suppliers |
| OPTIC SECURITY GROUP LIMITED | Removed | NZ Limited Company | 6495073 | government contract suppliers |
| OPTIMAL FLEET SOLUTIONS LIMITED | Registered | NZ Limited Company | 3766901 | government contract suppliers |
| OPTIMAL FOREST HARVESTING LIMITED | Registered | NZ Limited Company | 6831939 | councillor interest |
| OPTIMALBI LIMITED | Registered | NZ Limited Company | 2110569 | government contract suppliers |
| Optimed NZ Ltd | Unknown | - | - | government contract suppliers |
| OPTIMISM LIMITED | Registered | NZ Limited Company | 1597691 | government contract suppliers |
| OPTIMUM LIMITED | Removed | NZ Limited Company | 841086 | government contract suppliers |
| OPTIMUM SOLUTIONS LIMITED | Removed | NZ Limited Company | 801333 | government contract suppliers |
| OPTUS SATELLITE PTY LIMITED | Registered | Overseas ASIC Company | 5672187 | government contract suppliers |
| OPUHA WATER LIMITED | Registered | NZ Co-operative Company | 4776799 | councillor interest |
| Opus International Consultants | Unknown | - | - | government contract suppliers |
| Opus international Consultants Ltd Northern Region | Unknown | - | - | government contract suppliers |
| Opus International Consultants Ltd Rotorua | Unknown | - | - | government contract suppliers |
| ORA TIKA RONGOA MAORI RUNANGA LIMITED | Registered | NZ Limited Company | 5439586 | government contract suppliers |
| ORA TOA PHO LIMITED | Registered | NZ Limited Company | 1942404 | iwi subsidiaries |
| Oracle HCM | Unknown | - | - | government contract suppliers |
| ORACLE LIMITED | Removed | NZ Limited Company | 858000 | government contract suppliers |
| Oraeltec | Unknown | - | - | government contract suppliers |
| ORAI Omatata Residence Association Incorporated | Unknown | - | - | councillor interest |
| Ōrākei Health Services | Unknown | - | - | iwi subsidiaries |
| Orakei Korako Cave & Thermal Park | Unknown | - | - | kanoa recipients |
| Ōrākei Marae | Unknown | - | - | iwi subsidiaries |
| Oranga Tamariki | Unknown | - | - | councillor interest |
| ORANGE BUSINESS SERVICES NEW ZEALAND LIMITED | Registered | NZ Limited Company | 687638 | government contract suppliers |
| ORANGE PR MEDIA LIMITED | Registered | NZ Limited Company | 6267688 | political donors |
| ORATIA MEDIA LIMITED | Registered | NZ Limited Company | 1061835 | government contract suppliers |
| ORB SOLUTIONS LIMITED | Registered | NZ Limited Company | 1791766 | government contract suppliers |
| ORBICA LIMITED | In Liquidation | NZ Limited Company | 6212863 | government contract suppliers |
| ORBIS GROUP CONSULTING LIMITED | Registered | NZ Limited Company | 9326394 | government contract suppliers |
| ORBIT CONSULTING LIMITED | Registered | NZ Limited Company | 5833327 | councillor interest |
| Orbit Projet Management | Unknown | - | - | government contract suppliers |
| Orbit Travel Wellington | Unknown | - | - | government contract suppliers |
| ORBIT WORLD TRAVEL LIMITED | Registered | NZ Limited Company | 1106267 | government contract suppliers |
| ORBITZ ELEVATORS (NZ) PTY LIMITED | Removed | NZ Limited Company | 7693376 | government contract suppliers |
| ORCA ENGINEERING AND MARINE (2003) LIMITED | Registered | NZ Limited Company | 1296102 | government contract suppliers |
| ORCHARD ESTATE LIMITED | Removed | NZ Limited Company | 5818912 | councillor interest |
| ORCHARD WORX NORTHLAND LIMITED | Registered | NZ Limited Company | 6543492 | government contract suppliers |
| Orchestras Central Trust | Registered | Charitable Trust | - | mp interest |
| ORCHESTRATE PROJECT MANAGEMENT LIMITED | Registered | NZ Limited Company | 2274493 | government contract suppliers |
| ORDISH & STEVENS LIMITED | Registered | - | - | |
| OREGON GROUP LIMITED | Registered | NZ Limited Company | 560422 | political donors |
| OREIPUNGA ROAD LIMITED | Registered | NZ Limited Company | 1479236 | councillor interest |
| Oreti Cattery and Boarding Kennels | Unknown | - | - | councillor interest |
| ORETI MAR LIMITED | Removed | NZ Limited Company | 7037618 | kanoa recipients |
