| Acronym | Definition |
|---|
| WAS | Wide Area System |
| WAS | World Association for Sexual Health |
| WAS | Web Application Server |
| WAS | Web Application Security (consortium project) |
| WAS | War At Sea |
| WAS | Web-Based Applications & Services |
| WAS | Washington Union Station (Amtrak station code) |
| WAS | Wait And See |
| WAS | Wireless Access System |
| WAS | Web Application Stress tool (Microsoft) |
| WAS | Washington Academy of Sciences |
| WAS | Wait A Sec |
| WAS | Windows Process Activation Service (Microsoft Internet Information Services) |
| WAS | wide area surveillance (US DoD) |
| WAS | Wide Area Augmentation System |
| WAS | Water and Sewer |
| WAS | Website Analytics Software |
| WAS | World Aquaculture Society |
| WAS | Websphere Application Server |
| WAS | Waste Activated Sludge |
| WAS | Weeks After Seeding |
| WAS | We Are Scientists (band) |
| WAS | Whitsunday Anglican School (Australia) |
| WAS | Wiskott-Aldrich Syndrome |
| WAS | Worked All States (Amateur Radio) |
| WAS | Washington, DC - Commercial (general airport code covering all strips) |
| WAS | Work Authorization System |
| WAS | West Australian Standard Time (GMT+0700) |
| WAS | Whole Air Sampler |
| WAS | Warsaw Airport Services (Warsaw, Poland) |
| WAS | Web Attached Storage |
| WAS | Wartime-Authorized Strength |
| WAS | Wide Area Subsystem |
| WAS | Wadley Southern Railway Company |
| WAS | Workplace Automation System |
| WAS | War Authorized Strength |
| WAS | Weld Assembly Strongback |
| WAS | Wartime Automated System |
| WAS | Wavelength Allocation Scheduling |
| WAS | Weapons Alerting System |
| WAS | Westfield Avenues Site |
| WAS | Weymouth Ambulance Station |
| WAS | Werkgroep Allochtone Studenten (Dutch: Workgroup for Foreign Students) |