Empusa (Ancient Greek: Ἔμπουσα, Empousa, of unknown meaning) is a demigoddess of Greek mythology. In later incarnations she appeared as a species of monsters commanded by Hecate (known in English as an empuse).
She is often associated or grouped with the demigoddesses Lamia and Mormo, who were likewise related as a kind of spectres in later mythology (the lamias and mormolyceas, respectively).