WAAS is Wide Area Augmentation System, an air navigation aid to supplement GPS.
WAAS, Waas, or WaaS may also refer to:
Computing Wide area application services, technology by Cisco Systems Windows as a service, a business model for Microsoft Windows 10 Workspace as a Service, in desktop virtualization
Other uses Waas (surname) Mount Waas, mountain in Grand County, Utah, US World Academy of Art and Science, an international organization Waas, the Shaetlan name for the village of Walls in Shetland