| WAO | Port Orchard, Washington Chapter 
| Others |
| WAO | Wabo, Papua New Guinea
| Others |
| WAO | Wales Audit Office
| Others |
| WAO | Warren Alvarado Oslo
| Others |
| WAO | WARREN/ ALVARADO/ OSLO PUBLIC SCHOOLS
| Others |
| WAO | Watch Anime Online
| Others |
| WAO | We Are Oceania
| Others |
| WAO | We Are One
| Others |
| WAO | We Are Oreskaband
| Others |
| WAO | We Are Outrageous
| Others |
| WAO | We As One
| Others |
| WAO | Weather and Ambience Overhaul
| Others |
| WAO | Web Application Owner
| Others |
| WAO | Wet Air Oxidation
| Others |
| WAO | Whitewater Adventure Outfitters
| Others |
| WAO | Wild Animal Orphanage
| Others |
| WAO | Wisconsin Academy of Ophthalmology
| Others |
| WAO | Wise Agent Orb
| Others |
| WAO | Wise Argent Orb
| Others |
| WAO | Women's Aid Organisation
| Others |
| WAO | Women's American ORT
| Others |
| WAO | Work Area Outlet
| Others |
| WAO | Workshop on Accelerator Operations
| Others |
| WAO | World Agility Open
| Others |
| WAO | World Agricultural Outlook
| Others |
| WAO | World Allergy Organization
| Others |
| WAO | World Allergy Organization - IAACI
| Others |
| WAO | World Autism Organisation
| Others |
| WAO | Wrightwood Ashburn Overcomers
| Others |
| WAO | Wrong Answers Only
| Others |
| WAO | Wyoming Admissions Officers
| Others |