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 US Department of Defense computer systems

See also

• Akas (disambiguation)