ISAS may refer to:
- International School for Advanced Studies, a post-graduate teaching and research institute in Trieste, Italy
- Institute of Space and Astronautical Science, a Japanese research institute which is former independent space agency, now a part of Japan Aerospace Exploration Agency (JAXA).
- Independent Schools Association of the Southwest, an association of 89 independent schools located in Arizona, Kansas, Louisiana, New Mexico, Oklahoma, and Texas.
- Ictal-Interictal SPECT Analysis by SPM, a method of localizing seizures
disambiguation page lists articles associated with the title ISAS.
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