| Polyaigos | |
| Native Name: | Πολύαιγος |
| Native Name Lang: | el |
| Coordinates: | 36.7514°N 24.6364°W |
| Map: | Greece |
| Archipelago: | Cyclades |
| Area Km2: | 18.146 |
| Highest Mount: | Psilo Vouno |
| Elevation M: | 370 |
| Country: | Greece |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | South Aegean |
| Country Admin Divisions Title 1: | Regional unit |
| Country Admin Divisions 1: | Milos |
| Country Admin Divisions Title 2: | Municipality |
| Population: | 0 |
| Population As Of: | 2001 |
| Postal Code: | 840 00 |
| Area Code: | 228x0 |
| Registration Plate: | EM |
Polýaigos (Greek, Modern (1453-);: Πολύαιγος; Latin: Polyaegus[1]) is an uninhabited Greek island in the Cyclades near Milos and Kimolos. It is part of the community of Kimolos (Κοινότητα Κιμώλου). Its name means "many goats", since it is inhabited only by goats. It was mentioned by several ancient geographers: Ptolemy, Pliny the Elder, and Pomponius Mela.
Along its longest axis, it is 6km (04miles) and among its shortest 4.3km (02.7miles) wide. It has a surface area of approx. 180NaN0 and a coastal length of 22kmto27kmkm (14milesto17mileskm). It is very close to the island of Kimolos (2km (01miles) north west from Polyaigos) and to the island of Milos (6.2km (03.9miles) west from Polyaigos). There are two mounts, Stroggylo which rises to 330m (1,080feet) and Psilo Vouno (370m (1,210feet)).
The island is to a great extent privately owned by the Greek Orthodox church, which sublets parts of it to local herdsmen from the nearby islands of Milos and Kimolos.
Its goat population maintains Polyaigos as a barren island. It has, however, some magnificent beaches, mainly on the southern part of the island, as well as many sea-surface caves, which serve as a refuge to a dwindling population of Mediterranean monk seals (Monachus monachus).