Lagadia (Greek: Λαγκάδια) is a mountain village and a former municipality in Arcadia, Peloponnese, Greece.

It is considered a traditional settlement and is situated on a mountain slope, at about 1000 m elevation.

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.

The municipal unit Langadia is subdivided into the following communities (constituent villages in brackets): Lagadia is located in central Peloponnese and has a Mediterranean climate with hot and dry summers and milder winters.