Athinaio (; before 1928 , ) is a village and a community in the municipal unit of Valtetsi, Tripoli, Arcadia, Greece. It is situated on a hillside, north of the river Alfeios. The community includes the village Marmaria. Athinaio is 2 km southwest of Asea, 10 km east of Megalopoli and 16 km southwest of Tripoli. The A7 motorway (CorinthâÂÂTripoliâÂÂKalamata) passes south of the village.