Kimolos is a Greek island in the Aegean Sea. It lies on the southwest of the complex of Cyclades, near the bigger island of Milos. Kimolos is the administrative center of the municipality of Kimolos, which also includes the uninhabited islands of Polyaigos, Agios Efstathios and Agios Georgios.

The island belongs to the complex of the Western Cyclades and it is connected to nearby islands and Piraeus port via year-round ferry boat and a catamaran ferry running only during the high season. Itineraries’ frequency varies with the season. During the high season, it usually has daily connection to Piraeus and other islands. Also, transport via Milos is possible because of the frequent connection of the two islands with local ferry boat. Finally, Kimolos is a station for the local connections between Cyclades islands.

Kimolos lies to the northwest of larger Milos island, separated from it by a 1 km wide channel. It is round-shaped, approximately 7 km in radius. The island has a total area of 36 square kilometres while the municipality's land area is 53.251 square kilometres. The highest point is mount Paleokastro, at 364 metres. The only town is Chorio, located on a hill on the west of the island. There are also smaller settlements of Psathi (port), Goupa, Kara, Prasa, Aliki, Bonatsa and Dekas. To the east of Kimolos lies the island of Polyaigos, half its size. Polyaigos is the largest uninhabited island of Aegean.

The island reported a population of 910 inhabitants in the 2011 census. According to the last census, the population of Kimolos is decreasing, and no more than 600 residents remain during winter. Most of the working population is involved with the tourist industry of the island (hotels, restaurants) in combination with agriculture activities, mainly during winter.

Kimolos has a local Police Department. The Kimolos Port Authority is a department of Milos Coast Guard. There are also public means of transport, such as bus and taxi, performing itineraries to popular beaches.

Kimolos, Milos and the smaller islands that surround them belong to the Aegean volcanic arc and consist mainly of acidic volcanic rocks. In some places, the pre-volcanic bedrock can be observed. Large areas of Kimolos are covered by tuffs and the volcanic activity can be obvious from the hot springs, existence of a notable geothermal field, the characteristic landscape and strange landforms. The island is also rich in minerals of the silica group and in significant industrial minerals.