| A&AR | Accounting and Auditing Releases 
| Others |
| AAR | Aarhus, Denmark
| Others |
| AAR | Abandoned Animal Rescue
| Others |
| AAR | Able And Ready
| Others |
| AAR | Academic Advisement Report
| Others |
| AAR | Academic Advising and Registration
| Others |
| AAR | Academic Advising Registration
| Others |
| AAR | Accelerated Access Review
| Others |
| AAR | Access A Ride
| Others |
| AAR | Accumulation Area Ratio
| Others |
| AAR | Administrative Adjustment Request
| Others |
| AAR | Adobe Acrobat Reader
| Others |
| AAR | Advanced Authentic Research
| Others |
| AAR | Affirmative Action Repres
| Others |
| AAR | Affirmative Action Representative
| Others |
| AAR | Affirmative Action Review
| Others |
| AAR | Africa Air Rescue
| Others |
| AAR | African American Review
| Others |
| AAR | After Action Report
| Others |
| AAR | After Action Reports
| Others |
| AAR | After Action Request
| Others |
| AAR | After Action Review
| Others |
| AAR | After Action Reviews
| Others |
| AAR | After Action Rub
| Others |
| AAR | Aftermarket Automotive Review
| Others |
| AAR | Against All Risks
| Others |
| AAR | Agent Activation Runtime
| Others |
| AAR | Agent Architecture
| Others |
| AAR | Air-to-Air Refueling
| Others |
| AAR | Airport Acceptance Rate
| Others |
| AAR | Airport Arrival Rate
| Others |
| AAR | Alabama Association of Realtors
| Others |
| AAR | Alanine Aminotransferase Ratio
| Others |
| AAR | Alfa Access Renova
| Others |
| AAR | Alkali Aggregate Reaction
| Others |
| AAR | All About Romance
| Others |
| AAR | All Activity Roadster
| Others |
| AAR | All American Racers
| Others |
| AAR | All American Racing
| Others |
| AAR | All American Rejects
| Others |
| AAR | All-American Rejects
| Others |
| AAR | Allen Aircraft and Radio
| Others |
| AAR | Alliance for Aging Research
| Others |
| AAR | Alternate Assessment Reading
| Others |
| AAR | American Academy in Rome
| Others |
| AAR | American Academy of Religion
| Others |
| AAR | American Association of Railroaders
| Others |
| AAR | American Association of Railroads
| Others |
| AAR | Ancient and Accepted Rite
| Others |
| AAR | Anglo-Australian Resources
| Others |
| AAR | Angular Adjusted Roller
| Others |
| AAR | Anime Academy Radio
| Others |
| AAR | Annual Accreditation Report
| Others |
| AAR | Annual Accreditation Reports
| Others |
| AAR | Anticipation Action Reflection
| Others |
| AAR | Anuarul Arheologic din Romania
| Others |
| AAR | Aortic Aneurysm Repair
| Others |
| AAR | Appearance Approval Report
| Others |
| AAR | Approved Auto Repair
| Others |
| AAR | Arbitrary Angle Reduction
| Others |
| AAR | Arcadia Association of REALTORS
| Others |
| AAR | Area at Risk
| Others |
| AAR | Arizona Association of REALTORS
| Others |
| AAR | Armed American Radio
| Others |
| AAR | Army Artillery Reference
| Others |
| AAR | Ars Anime Recommendations
| Others |
| AAR | Artificial Aquifer Recharge
| Others |
| AAR | Ask Advise Refer
| Others |
| AAR | Association for Automated Reasoning
| Others |
| AAR | Association Of Alexandria Radiologists
| Others |
| AAR | Association of American Railroads
| Others |
| AAR | Association of Authors Representatives
| Others |
| AAR | Association of Authors' Representatives
| Others |
| AAR | AST / ALT Ratio
| Others |
| AAR | Attendee Acquisition Roundtable
| Others |
| AAR | Austin Auto Refurbishing
| Others |
| AAR | Autodesk Authorized Reseller
| Others |
| AAR | Autoliv Asia Roh
| Others |
| AAR | Automated Agency Report
| Others |
| AAR | Automatic Acronym Retrieval
| Others |
| AAR | Automatic Air Recirculation
| Others |
| AAR | Automatic Alternate Routing
| Others |
| AAR | Automatic Alternative Route
| Others |
| AAR | Automotive Accident Rate
| Others |
| AAR | Average Annual Rainfall
| Others |
| AAR | Average Annual Return
| Others |
| AAR | Average Art Rating
| Others |