Kos Ancient Agora is an excavated ancient market place located in Kos town on the island of Kos.
The market was considered one of the largest in the ancient world. It was built next to the harbour with a huge ornate entrance. It had a large spacious rectangular yard in the middle, surrounded by shops. The market was destroyed by an earthquake in 469 AD
The southern end of the market contained a round building with a domed roof. This was roman in origin and produced pigments including Egyptian Blue. On the western side of the market rooms were discovered containing mosaic floors.
Today the Agora is freely open to the public.