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