- ACSIS stands for Advanced Cultural Studies Institute of Sweden (est. 2002; Linköping University)
- ACSIS stands for Australian Centre for Science, Innovation and Society (University of Melbourne)
- ACSIS stands for American Council for the Study of Islamic Societies (La Salle University; Philadelphia, PA)
- ACSIS stands for Australian Consulting Surveyors Insurance Society (Australia)
- ACSIS stands for Aegis Combat System Interface Simulation
- ACSIS stands for Army C4I and Simulations Initialization System (US Army)
- ACSIS stands for Auto-Correlation Spectral Imaging System (astronomical instrumentation)
ACSIS