Karytaina or Karitaina is a village and a community in Arcadia, Greece. Karytaina is situated on a hill on the right bank of the river Alpheios, near its confluence with the Lousios. The village dates back to the Middle Ages, but its history is unknown before the Crusader conquest ca. 1205. Karytaina became the seat of a barony under the Frankish Principality of Achaea, and the Castle of Karytaina was built in the mid-13th century on a steep rocky outcrop by Baron Geoffrey of Briel. The area returned to Byzantine control in 1320, and came under Ottoman control in 1460. After a brief period of Venetian rule (1687–1715), Karytaina returned to Ottoman control, and prospered as an administrative and commercial centre. Karytaina and its inhabitants were among the first to rise up during the Greek War of Independence of 1821–29. Today Karytaina is a protected traditional settlement and has, alongside the remains of its Frankish castle, several other medieval and Ottoman monuments.

Gortyna , is a former municipality in Arcadia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Megalopoli, of which it is a municipal unit. Its seat was in the village Karytaina. The name of the municipality was taken from the ancient city of Gortys.