Lagadia is a mountain village and a former municipality in Arcadia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Gortynia, of which it is a municipal unit. The municipal unit has an area of 79.475 km2. The seat of the municipality was the village Lagadia. It is considered a traditional settlement and is situated on a mountain slope, at about 1000 m elevation. It is 5 km east of Lefkochori, 10 km north of Dimitsana and 36 km northwest of Tripoli.