Amfissa ( , also mentioned in classical sources as Amphissa) is a town in Phocis, Greece, part of the municipality of Delphi, of which it is the seat and a municipal unit. It lies on the northern edge of the olive forest of the Crissaean plain, between two mountains, Giona to the west and Parnassus to the east, northwest of Athens and of Delphi, as well as northeast of Naupactus and south of Lamia.