ISAS

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 currently part of the Japan Aerospace Exploration Agency
 * 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