Illus (died 488) is a Byzantine general, who plays an important role in the reigns of the Byzantine Emperors Zeno and Basiliscus.

Illus supportes the revolt of Basiliscus against Zeno, then switches sides, supporting the return of Zeno (475-476).

Illus serves Zeno well, defeating the usurper Marcian, but comes into conflict with the dowager Empress Verina, and supports the revolt of Leontius, but the rebellion fails and Illus is killed.