| ACAR | a-Star Capabilities for Automotive Research 
| Others |
| ACAR | Absolute Cumulative Abnormal Return
| Others |
| ACAR | Ada County Association of REALTORS
| Others |
| ACAR | Aged Care Approvals Round
| Others |
| ACAR | Air Conditioning And Refrigeration
| Others |
| ACAR | Air Control Man Airman Recruit
| Others |
| ACAR | Air Traffic Controller Airman Recruit
| Others |
| ACAR | Aircraft Communications Addressing and Reporting
| Others |
| ACAR | Akron Cleveland Association of REALTORS
| Others |
| ACAR | Al's Certified Auto Repair
| Others |
| ACAR | Alabama Coalition Against Rape
| Others |
| ACAR | Aluminium Conductor Alloy Reinforced
| Others |
| ACAR | Aluminum Conductor Alloy Reinforced
| Others |
| ACAR | Aluminum Conductor Aluminum Reinforced
| Others |
| ACAR | Angular Correlation of Annihilation Radiation
| Others |
| ACAR | Aryl Carboxylic Acid Reductase
| Others |
| ACAR | Asociatia Constructorilor de Automobile Din Romania
| Others |
| ACAR | Average Cumulative Abnormal Returns
| Others |
| ACAR | Avtoclub Assistance Russia
| Others |
| ACAR | Azrieli Centre for Autism Research
| Others |