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