UAS may refer to:
- United Arab States, a union between the United Arab Republic (Egypt and Syria) and North Yemen.
- Unmanned Aircraft System
- Undergraduate Ambassadors Scheme
- Universal Anchorage System
- University of Agricultural Sciences (disambiguation)
- University of Alaska Southeast
- University of Alabama System
- University of Applied Sciences (disambiguation)
- University of Agricultural Sciences, Dharwad
- University Air Squadron
- Upstream Activating Sequence, a genetic sequence
- Universidad Autónoma de Sinaloa, the Spanish name of the Autonomous University of Sinaloa.
- USB Attached SCSI
- User Agent Server, the part of a Session Initiation Protocol user agent that is behaving like a client-server server (as opposed to UAC, User Agent Client).
- Unity Asset Server, an SCM tool for the Unity3D game engine.