ISAT can stand for:
International Subarachnoid Aneurysm Trial Illinois Standards Achievement Test Idaho Standards Achievement Test In Situ Adaptive Tabulation International Student Admissions Test International Schools Association of Thailand Internet Security Awareness Training Innovative Space-based Radar Antenna Technology Institut supérieur de l'automobile et des transports Iodine Satellite In Stars and Time Isat Buchanan, Jamaican politician
See also I.Sat—Latin American cable channel