In Greek mythology, Aegialeus (also Aegealeus, Egialeus) is a name attributed to several individuals.
- Aegialeus (king of Sicyon), one of the sons of the river god Inachus.
- Aegialeus (king of Argos), elder son of Adrastus, a king of Argos
- Aegialeus was, in a tradition followed by Pacuvius, Justin, and Diodorus, the name given to the son of Aeëtes, who was murdered by Medea.