Agde (anc, Agatha), a city of southern France, department of Herault, 95 m. W. of Marseilles; pop. in 1866, 9,586. It lies a short distance from the Mediterranean, on the left bank of the river Herault, into which the Lan-guedoc canal (canal du Midi) flows at this point.

The town is entirely built of basaltic lava from a neighboring mountain. It is the seat of considerable trade with Italy, Spain, and Africa. It was founded by the Greeks of Massilia (Marseilles) about 590 B. C. Alaric II., king of the Visigoths, held a council here in 506.