In Greek mythology, Macar (; Ancient Greek: Μάκαρ Makar) or Macareus (; Μακαρεύς Makareus means "happy") or Macareas (Μακαρέας, Makareas), is the name of several individuals:
- Macareus, a son of Lycaon, eponym of the town of Macaria in Arcadia.
- Macareus, son of Aeolus and either Enarete or Amphithea.
- Macareus, one of the Heliadae, children of Rhodus and Helios, who became king of Lesbos.
- Macareus, one of the Lapiths at the wedding of Pirithous and Hippodamia; he killed the Centaur Erigdupus .
- Macareus, a companion to Odysseus on his voyages, from Nericus, who also encountered Aeneas. He was one of those who got transformed into pigs by Circe.
- Macareus, a king of Locris and father to Euboea. He may be the same with Macareus, father of Megaclite who consorted with Zeus and became the mother of Thebe and Locrus.