| Abbreviation | Definition |
|---|---|
| NZSA | New Zealand Society of Actuaries |
| NZSA | New Zealand Society of Archivists |
| NZSAP | New Zealand Society of Animal Production |
| NZSME | New Zealand Society for Music Education |
| NZSMT | New Zealand Society for Music Therapy |
| NZSP | New Zealand Society of Physiotherapists |
| NZSS | New Zealand Speleological Society |
| OA | Ordem dos Advogados |
| OA | Order of Advocates |
| OACAS | Ontario Association of Children’s Aid Societies |
| OAGM | Austrian Association for Pattern Recognition |
| OAGM | Österreichische Arbeitsgemeinschaft für Mustererkennung |
| OAGM | sterreichische Arbeitsgemeinschaft fr Mustererkennung |
| OAI | Order of Architects and Consulting Engineers (Luxembourg) |
| OAI | Ordre des Architectes et des Ingénieurs-Conseils |
| OAI | Ordre des Architectes et des Ingnieurs-Conseils |
| OARS | Orlando Area Rowing Society |
| OAS | Ohio Academy of Science |
| OAS | Oklahoma Academy of Science |
| OAS | Ophthalmic Anesthesia Society |