| OCC HOLDINGS LIMITED | Registered | NZ Limited Company | 6407913 | councillor interest |
| OCCUPATIONAL HEALTH CANTERBURY LIMITED | Registered | NZ Limited Company | 4486682 | government contract suppliers |
| OCD LIMITED | Removed | NZ Limited Company | 1695600 | government contract suppliers |
| OCDER LIMITED | Registered | NZ Limited Company | 6490354 | councillor interest |
| OCEAN ADVENTURES HB LIMITED | Registered | NZ Limited Company | 2310559 | government contract suppliers |
| OCEAN BEACH WILDERNESS PROPERTY LIMITED | Removed | NZ Limited Company | 1225040 | kanoa recipients |
| OCEAN DESIGN GROUP LIMITED | Registered | NZ Limited Company | 403675 | government contract suppliers |
| OCEAN ENVIRONMENTAL LIMITED | Registered | NZ Limited Company | 7442019 | government contract suppliers |
| OCEAN INFINITY (AUSTRALIA) PTY LTD | Registered | Overseas ASIC Company | 3199269 | government contract suppliers |
| Ocean Sports Club | Unknown | - | - | councillor interest |
| OCEANIA CONSULTANTS LIMITED | Registered | NZ Limited Company | 6624053 | government contract suppliers |
| OCEANIA HEALTHCARE LIMITED | Registered | NZ Limited Company | 1656055 | mp interest |
| OCEANIA LIMITED | Removed | NZ Limited Company | 4897639 | government contract suppliers |
| Oceania Marine Group | Unknown | - | - | kanoa recipients |
| Oceans North Liimted | Unknown | - | - | government contract suppliers |
| OCHO Chocolate | Unknown | - | - | councillor interest |
| OCHO LIMITED | Registered | NZ Limited Company | 6435392 | councillor interest |
| OCL LIMITED | Registered | NZ Limited Company | 1852400 | government contract suppliers |
| Ocon Group | Unknown | - | - | government contract suppliers |
| OCP II Limited Partnership | Registered | Limited Partnership (NZ) | - | kanoa recipients |
| OCP LIMITED | Registered | NZ Limited Company | 8250720 | government contract suppliers |
| OCS GROUP NZ LIMITED | Registered | NZ Limited Company | 1276974 | government contract suppliers |
| OCTA ASSOCIATES LIMITED | Registered | NZ Limited Company | 134887 | government contract suppliers |
| OCTA Project Management | Unknown | - | - | government contract suppliers |
| OCULUS BUILDING SCIENCE AND FACADES LIMITED | Registered | NZ Limited Company | 6757318 | government contract suppliers |
| ODLUM GROUP LIMITED | Registered | NZ Limited Company | 2177663 | government contract suppliers |
| ODYSSEUS TRUSTEES LIMITED | Removed | NZ Limited Company | 4327558 | councillor interest |
| ODYSSEY GLOBAL LIMITED | Registered | - | - | |
| Odyssey House Trust Christchurch | Registered | Charitable Trust | - | government contract suppliers |
| ODYSSEY LIMITED | Registered | NZ Limited Company | 570249 | government contract suppliers |
| OEMI LABS LIMITED | Registered | NZ Limited Company | 9404390 | councillor interest |
| Oeo Pa Trustees | Unknown | - | - | kanoa recipients |
| OFF GRID ELECTRICAL LIMITED | Registered | NZ Limited Company | 6405472 | government contract suppliers |
| OFF THE RAILS HONEY LIMITED | Registered | - | - | |
| OFFICEMAX HOLDINGS LIMITED | Registered | NZ Limited Company | 1018908 | government contract suppliers |
| OFFICEMAX NEW ZEALAND LIMITED | Registered | NZ Limited Company | 412914 | government contract suppliers |
| OFFSHORE PLUMBING SERVICES LIMITED | Registered | NZ Limited Company | 2291789 | government contract suppliers |
| OGILVIE MANDER TRADING LIMITED | Registered | NZ Limited Company | 1399379 | government contract suppliers |
| OHA HONEY NORTH AMERICA LIMITED | Removed | NZ Limited Company | 7972856 | iwi subsidiaries |
| Ohaeawai Community Cultural Centre | Registered | Incorporated Society | - | kanoa recipients |
| Ohai Railway Fund Committee | Unknown | - | - | councillor interest |
| Ohariu Family Trust | Unknown | - | - | councillor interest |
| OHAU WINE GROUP LIMITED | Removed | NZ Limited Company | 3443192 | councillor interest |
| OHAU WINES LIMITED | Registered | NZ Limited Company | 4133643 | councillor interest |
| OHAUPO DAIRIES LIMITED | Registered | NZ Limited Company | 2067606 | councillor interest |
| Ohaupo Ngahinapouri Lions Club | Unknown | - | - | councillor interest |
| Ohinemuri Club Inc. | Registered | Incorporated Society | - | councillor interest |
| Ohingaiti School Bus Society Incorporated | Registered | Incorporated Society | - | government contract suppliers |
| OHO MAI AOTEAROA LIMITED | Registered | NZ Limited Company | 9266608 | councillor interest |
| OHO MAURI SOLUTIONS LIMITED | Registered | NZ Limited Company | 7178696 | kanoa recipients |
