Meliboea or Meliboia (Ancient Greek: Μελίβοια) was a town and polis (city-state) of Magnesia in ancient Thessaly, mentioned by Homer, in the Catalogue of Ships in the Iliad, as one of the places subject to Philoctetes. It was situated upon the sea coast, and is described by Livy as situated at the roots of Mount Ossa, and by Strabo as lying in the gulf between Mount Ossa and Mount Pelion.
The town was famous for its purple dye. Even down to the 19th century, the shellfish from which the purple dye is obtained were found off the coast of Thessaly.