Phthira (Ancient Greek: Φθίρα) was a mountain in ancient Caria, inhabited by the Phthires, a non-Greek people. It is evidently the same as the Phtheiron oros (Φθειρῶν ὄρος) called "wood-crowned" by Homer in the Iliad, which, according to Hecataeus, was identical with Mount Latmus, but which others supposed to be the same as Mount Grium, running parallel to Mount Latmus.
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Phthira". Dictionary of Greek and Roman Geography. London: John Murray.