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Echinaioi (Greek: Εχιναίοι) is a former municipality in Phthiotis, Greece. Since the 2011 local government reform it is part of the municipality Stylida, of which it is a municipal unit.
The municipal unit has an area of 133.052 km. Population 3,279 (2021). The seat of the municipality was in Raches. The name of the municipality derives from the inhabitans of the ancient city of "Echinos", today's Achinos village.