| Acronym | Definition |
|---|
| ACIN | Asociación de Cabildos Indígenas del Norte del Cauca (Spanish: Association of Northern Cauca Indigenous) |
| ACIN | Automation and Control Institute (Vienna University of Technology; Vienna, Austria) |
| ACIN | Institut für Automatisierungs- und Regelungstechnik (English: Automation and Control Institute, University of Technology, Vienna, Austria) |
| ACIN | All County Information Notices (information sharing documents; various agencies; California) |
| ACIN | Anal Canal Intraepithelial Neoplasia |
| ACIN | Applied Communications and Information Networking Technologies Program |