Pyrgos Kallistis (Greek: Πύργος Καλλίστης, lit. 'Beauty Tower') or simply Pyrgos (Greek: Πύργος, lit. 'Tower') is a village on the Aegean island of Santorini, Greece, in the Cyclades archipelago with a population of 1,078 according to the 2021 census. Pyrgos is part of the Municipality of Thira and is situated approximately 7 km away from the island's capital Fira. It is built amphitheatrically on a hill that offers magnificent views of Santorini in almost all directions. On top of this hill remain the ruins of a Venetian castle (Kasteli) that was once the island's administrative center. Pyrgos is a typical example of medieval architecture with narrow, labyrinthine streets, fortified walls and hidden passages. Nowadays it is one of the villages of Santorini least spoiled by tourism.

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  Church in Pyrgos
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  A street in the old town
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  A passage
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  View from the ruins of Kasteli
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  Kasteli lit up on a Good Friday night
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  Panoramic view of most of the island from Pyrgos