Dascylium was a city in ancient Mysia or Bithynia, capital of Hellespontine Phrygia.

Dascylium or Daskylion () or Daskyleion (Δασκυλεῖον) may also refer to: Dascylium (Aeolis), a town of ancient Aeolis Dascylium (Bithynia), a town of ancient Bithynia on the Sea of Marmara, Anatolia Dascylium (Caria), a town of ancient Caria near Ephesus, Anatolia Dascylium (southern Caria), a town of ancient Caria further south than the prior, Anatolia Dascylium (Ionia), a town of ancient Ionia, Anatolia