Langadia (Greek: Λαγκάδια) 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 seat of the municipality was the village Langadia. The village Langadia 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. The Greek National Road 74 (Pyrgos - Olympia - Tripoli) passes through the village.
The village has a school, a church, a post office, and a square. It is known for its local weaving mill. Langadia used to be famous in Greece mainly about its builders (called pelekanoi), that made stone-built houses all over the Peloponnese peninsula, and especially in Mani.Kanellos Deligiannis, one of the many heroes of the Greek War of Independence against the Turks in 1821, was born here.