ACAS or Acas may refer to:
Aviation
- Airborne collision avoidance system, an International Civil Aviation Organization standard
 - Assistant Chief of the Air Staff, a senior appointment in the Royal Air Force
 
Other uses
- Aboriginal Children's Advancement Society, an organization in New South Wales
 - Acas (Advisory, Conciliation and Arbitration Service), an independent non-departmental public body of the Government of the UK
 - Acâș, a commune in Satu Mare County, Romania
 - Acas District, Ocros, Peru
 - Associate in the Casualty Actuarial Society, a level of membership in the Casualty Actuarial Society
 - Assured Compliance Assessment Solution, a tool that automatically identifies configuration vulnerabilities on United States Department of Defense computer systems
 
See also
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