Serrion Teichos (Ancient Greek: Σέρριον τείχος) or Serreion Teichos (Σέρρειον τεῖχος) was a Greek city in ancient Thrace, located in the region of the Propontis. It was a member of the Delian League and appears in tribute lists of Athens between 428/7 and 418/7 BCE. It later bore the name of Ganus or Ganos (Γάνος or Γᾶνος). It is under this name that the town is mentioned by geographers and historians, as a noted mountain fortress of Thrace.
- Mogens Herman Hansen & Thomas Heine Nielsen (2004). "Propontic Thrace". An inventory of archaic and classical poleis. New York: Oxford University Press. p. 922. ISBN 0-19-814099-1.
- Richard Talbert, ed. (2000). Barrington Atlas of the Greek and Roman World. Princeton University Press. p. 52, and directory notes accompanying.
- Xenophon, Anab., 7.5.8; Harpocration, s.v. Γάνος; Suda, s.v. Γάνος; Periplus of Pseudo-Scylax, 28; Pliny. Naturalis Historia. Vol. 4.18.
- Lund University. Digital Atlas of the Roman Empire.