| Acronym | Definition |
|---|
| WAO➣World Allergy Organization |
| WAO➣Women's Aid Organisation (Malaysia) |
| WAO➣Wet Air Oxidation |
| WAO➣Wild Animal Orphanage |
| WAO➣Work Area Outlet |
| WAO➣World Autism Organisation |
| WAO➣Workshop on Accelerator Operations |
| WAO➣Women's American ORT |
| WAO➣Wet Op Arbeidsongeschiktheid (legislation, Netherlands) |
| WAO➣World Association for Orphans and Abandoned Children (various locations) |
| WAO➣Weapons Assignment Officer |
| WAO➣Weighted Average of Individual Offsets |
| WAO➣Washington Area Office |
| WAO➣Weeks After Order |
| WAO➣We Are One, Inc. |