ACAS

ACAS may refer to:

In aviation:

• Air Cargo Advance Screening
• Airborne Collision Avoidance System, an International Civil Aviation Organization standard
• Assistant Chief of the Air Staff, a senior appointment in the Royal Air Force

In Health Care:

• Advanced Care Assistance System

In other fields:

• 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 United Kingdom
• Acâș, a commune in Satu Mare County, Romania
• American Capital, (Nasdaq: ACAS) a publicly traded private equity firm and global asset manager
• 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 Department of Defense computer systems.
• Applewood Computers Accounting System, an open source accounting system written in COBOL