In Greek mythology, Ischys was the son of Elatus and Hippea and the lover of Coronis. Whilst Coronis was carrying Apollo's child, a white bird called a crow told Apollo (or possibly Artemis) of the affair between Ischys and Coronis. Apollo was so angry that he first turned the crow's feathers black and then killed Ischys.

ISCHYS is also the name of the global-coverage Cyprus Youth and Students NGO (Cypriot Students and Young Scientists Organisation ISCHYS (ISXYS).