| ACAI | Advanced Course on Artificial Intelligence 
| Others |
| ACAI | Aerostar Continued Airworthiness Instructions
| Others |
| ACAI | Alkali and Clean Air Inspectorate
| Others |
| ACAI | American Canoe Association, Incorporated
| Others |
| ACAI | American College of Allergy and Immunology
| Others |
| ACAI | Angelcare Children's Aid International
| Others |
| ACAI | Antique and Collectible Autos Inc.
| Others |
| ACAI | Antique Collectible Autos Inc
| Others |
| ACAI | Architecture Commune des Applications Informatiques
| Others |
| ACAI | Association of Consultant Approved Inspectors
| Others |
| ACAI | Associazione Concessionari Autobus Iveco
| Others |
| ACAI | Associazione Costruttori Acciaio Italiani
| Others |
| ACAI | Associazione Cristiana Artigiani Italiani
| Others |