Penteleium or Penteleion (Ancient Greek: Πεντέλειον) was a fortress in the north of ancient Arcadia near Pheneus, situated upon a mountain of the same name. Its site is unlocated.
This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Penteleium". Dictionary of Greek and Roman Geography. London: John Murray.