Possidi (Katharevousa: Poseidiou) is a coastal settlement of the municipality of Kassandra. It is located west of the peninsula of Kassandra in a prominence in the Thermaikos gulf, where there is the homonymous cape, in the area of the settlement of Kalandra which is a port. It dates back to antiquity as a settlement of ancient Chalkidiki, and today it is more known as a holiday village, where there are country houses, hotels and camping areas.