| ACIR | Adjacent Channel Interference Ratio 
| Others |
| ACIR | Advanced Certified Internet Recruiter
| Others |
| ACIR | Advances in Computational Intelligence and Robotics
| Others |
| ACIR | Advisory Commission on Intergovernmental Relations
| Others |
| ACIR | Advisory Committee on Investor Responsibility
| Others |
| ACIR | Atlanta Council on International Relations
| Others |
| ACIR | Australian Childhood Immunisation Register
| Others |
| ACIR | Auto Cad Image Renderer
| Others |
| ACIR | Automotive Crash Injury Research
| Others |