A king of the Bebryces in Bithynia (Asia Minor). He was a son of Poseidon and the Oceanid Melia, and the brother of Amycus. Mygdon was slain by Heracles who had sided with Lycus of Mysia. Heracles gave much of the land to Lycus, which was afterward called Heraclae.
- Pseudo-Apollodorus. The Library ii, 5.9.