Astyra (Ancient Greek: Ἀστυρα), also known as Astyrum or Astyron (Ἄστυρον), and perhaps also Andeira (Ἀνδειρα), was a small town of ancient Aeolis and of Mysia, in the Plain of Thebe, between Antandrus and Adramyttium. It had a temple of Artemis, of which the Antandrii had the superintendence. Artemis had hence the name of Astyrene or Astirene. There was a lake Sapra near Astyra, which communicated with the sea. Pausanias, from his own observations, describes a spring of black water at Astyra; the water was hot. But he places Astyra in the territory of Atarneus. There was, then, either a place in Atarneus called Astyra, with warm springs, or Pausanias has made some mistake; for there is no doubt about the position of the Astyra of Strabo and Pomponius Mela. Astyra was a deserted place, according to Pliny's authorities; he calls it Astyre. There are said to be coins of Astyra.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 56, and directory notes accompanying.
- Strabo. Geographica. Vol. p. 613. Page numbers refer to those of Isaac Casaubon's edition.
- Xenophon. Hellenica. Vol. 4.1.41.
- Pausanias. Description of Greece. Vol. 4.35.10.
- Pomponius Mela. De situ orbis. Vol. 1.19.
- Pliny. Naturalis Historia. Vol. 5.32.
- Athenian Tribute Lists
- Lund University. Digital Atlas of the Roman Empire.