UCAS may be the acronym of the Universities & Colleges Admissions Service, a clearing house for applications to degree programmes at British universities and colleges.
UCAS may also refer to:
- University of the Chinese Academy of Sciences, a public research university in Beijing, China
- Unified Canadian Aboriginal Syllabics, formal name of a script
- Unified Canadian Aboriginal syllabics (Unicode block), encoded script
- Unmanned Combat Air System(s)
- Utah County Academy of Sciences, a small charter high school in Orem, Utah, United States
- The United Canadian and American States, a country in the fictional Shadowrun universe.