ACSISAdvanced Cultural Studies Institute of Sweden (est. 2002; Linköping University)
ACSISAustralian Centre for Science, Innovation and Society (University of Melbourne)
ACSISAmerican Council for the Study of Islamic Societies (La Salle University; Philadelphia, PA)
ACSISAustralian Consulting Surveyors Insurance Society (Australia)
ACSISAegis Combat System Interface Simulation
ACSISArmy C4I and Simulations Initialization System (US Army)
ACSISAuto-Correlation Spectral Imaging System (astronomical instrumentation)