| Abbreviation | Definition |
|---|---|
| OWC | Oklahoma Weather Center |
| OWCP | Office of Workers Compensation Program |
| OWD | Ontario Women's Directorate |
| OWD | Orange Water District |
| OWH | Office on Women's Health |
| OWK | Old West Kansas |
| OWLC | Ontario Women’s Liberal Commission |
| OWM | Office of Waste Management |
| OWR | Office of Water Resources |
| OWRAC | Ontario Workforce Recovery Advisory Committee |
| OWRD | Oregon Water Resources Department |
| OWS | Office of Womerns' Services |
| OWW | Old World Wisconsin |
| OWW | One West Waikiki |
| OXN | Oxon Hill, Maryland |
| OYA | Oregon Youth Authority |
| OYD | Office of Youth Development |
| OYE | Office of Youth Employment |
| OYES | Oklahoma Youth Empowerment Systems |
| OYS | Office of Youth Services |