| Abbreviation | Definition |
|---|---|
| TNWC | The North West Company |
| TNZ | Telecom New Zealand |
| TNZ | The New Zealand Group, LTD. |
| TO | Trusted Organization |
| TOC | Train Operating Company |
| TOD | Terry Oldfield Discography |
| TOE | The Outdoor Experience |
| TOEPL | Technics Offshore Engineering Pte Ltd |
| TOESL | Thermax Onsite Energy Solutions Ltd |
| TOFI | This Old Farm Inc |
| TOFI | Toronto Office Furniture Inc |
| TOG | Talent Operations Group |
| TOG | The Olsh Group |
| TOHC | The Oxford Health Company |
| TOIC | Trans-Overseas Industrial Corporation |
| TOK | Tarh-O-Kavosh |
| TOK | Touch Of Klass |
| TOL | Touch Of Love |
| TOPS | Technical Office Paraprofessional Service |
| TOPS | Travel Options Planning Service |