| AAC | AIDS Action Council | In English | → Organizations and associations → Infectious diseases |
| AAC | Antimicrobial Agents and Chemotherapy | In English | → Medicine |
| AAC | Augmentative and Alternative Communication | In English | → Medicine |
| AAC | Austrian Academy Corpus | In English | → Libraries → Higher education, universities |
| AAC | Attaché d'Administration Centrale | In French | → Central administration |
| AAC | Advanced Audio Coding | In English | → Data |
| AAC | Apprentissage Anticipé de la Conduite | In French | → Education → Transport and postal services |
| AAC | Association des Amidonneries de Céréales de l'Union Européenne (www.aac-eu.org) | In French | → Associations → Food technology |
| AAC | Altforst Appeltern Combinatie | In Dutch | → Organizations and associations → Sport, physical exercises |
| AAC | Amstel Athletische Club | In Dutch | → Organizations and associations → Sport, physical exercises |
| AAC | Arnhemsche Athletische Club | In Dutch | → Organizations and associations → Sport, physical exercises |