Agistri is a small island and municipality in the Saronic Gulf in the Islands regional unit, Greece.
There are only three settlements on Agistri – Milos (Megalochori), Skala and Limenaria. Milos (pop. 566) is the main village where the majority of the Greek population of the island lives. Skala (pop. 448) is a twenty-minute walk from Milos along the coastal road. Skala is where most of the tourist facilities and hotels are. Limenaria (pop. 128) is a very small village on the other side of the island with very little tourism. The island’s population is 1,142 inhabitants according to the 2011 Greek census. Its land area is 13.367 km2 (5.161 sq mi)
Agistri is home to a wide variety of plants such as wild cyclamen, thyme, caper bushes, and thistles. The center of the island is covered in Pine forest. It hosts a population of chukar partridges. The rocky eastern coast is used as a breeding place by swifts. Noteworthy is a population of peafowls, which have been introduced to the island and since become feral.