Kosmas (Greek: Κοσμάς) is a mountain village and a former community in Arcadia, Peloponnese, Greece.

[3] Kosmas is situated in the southeastern part of the Parnon mountains, at about 1150 m elevation, on the road from Skala (Laconia) to Leonidio.

In the area which is now known as Kosmas was the ancient city of Selinous, which had a temple of Apollo.

Kosmas was first mentioned in 1592 in a letter of Gennadios, metropolitan of Monemvasia.

Many inhabitants of Kosmas participated in the Greek War of Independence.