In Greek mythology, Mestor (/ˈmɛstər/; Ancient Greek: Μήστωρ means "adviser" or "counsellor") was the name of four men.

• Mestor, a Mycenaean prince. According to the mythographer Apollodorus, he was the son of Perseus and Andromeda and the brother of Perses, Alcaeus, Heleus, Sthenelus, Electryon, and Gorgophone. By Lysidice, daughter of Hippodamia and Pelops, Mestor became the father of Hippothoe, who mothered Taphius by the god Poseidon.^[1]
• Mestor, a son of king Pterelaus,^[2] thus a great-great-grandson of the above.
• Mestor, a son of King Priam. Apart from a single mention in the Iliad, where he is praised by his father,^[3] he appears in the Bibliotheca^[4] and Hyginus.^[5] He was taken captive by Neoptolemus, who later dressed up in Mestor's Phrygian clothes to deceive Acastus.^[6]
• In Plato's Critias, Mestor was the second of the fourth set of twins borne of Poseidon and the mortal, Cleito, and one of the first princes of Atlantis.^[7] His older twin brother was Elasippus, and his other siblings were Atlas and Eumelus, Ampheres and Evaemon, Mneseus and Autochthon, and lastly, Azaes and Diaprepes.^[8] Mestor, along with his nine siblings, became the heads of ten royal houses, each ruling a tenth portion of the island, according to a partition made by Poseidon himself, but all subject to the supreme dynasty of Atlas who was the eldest of the ten.^[9]