| Acronym | Definition |
|---|
| ISAS | Institute of Space and Astronautical Science (Japan) |
| ISAS | Isdn Smart Attendant Services |
| ISAS | International Service Availability Symposium |
| ISAS | Institute of South Asian Studies |
| ISAS | International School for Advanced Studies |
| ISAS | Institute of Space and Aeronautical Science |
| ISAS | Institute of Sensor and Actuator Systems (Vienna University of Technology; Vienna, Austria) |
| ISAS | Illinois State Archaeological Survey (University of Illinois at Urbana-Champaign) |
| ISAS | Independent Schools Association of the Southwest |
| ISAS | Institute of Space and Atmospheric Studies (University of Saskatchewan) |
| ISAS | Information System Analysis and Synthesis |
| ISAS | Informatics Systems Analysis and Synthesis |
| ISAS | Institute for Space and Aeronautical Sciences |
| ISAS | International Student Advice Service (Zurich, Switzerland) |
| ISAS | Institute for the Synergy of Arts and Sciences |