In Greek mythology, the Meliae or Meliai were nymphs of the ash tree, whose name they shared. They appeared from the drops of blood spilled when Cronus castrated Uranus, according to Hesiod, Theogony 187. From the same blood sprang the Erinyes, suggesting that the ash-tree nymphs represented the Fates in milder guise (Graves 6.4). From the Meliae sprang the race of mankind of the Age of Bronze.

The Meliae belong to a class of sisterhoods whose nature is to appear collectively and who are invoked in the plural, though genealogical myths, especially in Hesiod, give them individual names, such as Melia, "but these are quite clearly secondary and carry no great weight" (Burkert 1985 III.3.2). The Melia thus singled out is one of these daughters of Oceanus. By her brother the river-god Inachus, she became the mother of Io, Phoroneus, Aegialeus or Phegeus, and Nilodice. In other stories, she was the mother of Amycus by Poseidon, as the Olympian representative of Oceanus.

Many species of Fraxinus, the ash trees, exude a sugary substance, which the ancient Greeks called méli, "honey". The species of ash in the mountains of Greece is Fraxinus ornus, Manna-ash. The Meliae were nurses of the infant Zeus in the Cretan cave of Dikte, according to Callimachus, Hymn to Zeus. They fed him honey.

Of "manna", the ash-tree sugar, the standard 19th-century US pharmacopeia,The Dispensatory of the United States of America (14th edition, Philadelphia, 1878) said: Fermented honey preceded wine as an entheogen in the Aegean world.