| Abbreviation | Definition |
|---|---|
| OCSWSSW | Ontario College of Social Workers and Social Service Workers |
| OCWG | Open Campaign Working Group |
| OCWG | Operational Capabilities Working Group |
| OCWG | Operational Coordination Working Group |
| OCWG | Operator Certification Working Group |
| OCWG | Oxford Clay Working Group |
| OSB | On the Same Boat |
| OUFS | Operable Unit Feasibility Study |
| OWG | Ontario Working Group |
| OWG | Outsourcing Working Group |
| P/L | Personal/ Sick Leave |
| PAA | Peer Assignment and Application |
| PAWG | Policy Affairs Working Group |
| PAWG | Portable Antiquities Working Group |
| PAWG | Probabilistic Assessment Working Group |
| PAWG | Public Art Working Group |
| PCWG | Parish Charter Working Group |
| PCWG | Pastoral Care Working Group |
| PCWG | Pharmacy Compounding Work Group |
| PCWG | Polar Climate Working Group |