Adamantas (Greek: Αδάμαντας, older form Αδάμας, from the Greek αδάμας adamas 'diamond') is the harbour town of Milos island. It has a population of 1,268 people (2021).

Highlights include the French cemetery, used in the years of the Crimean war; the 600-year-old church of the Holy Trinity; the Milos Mining Museum; and the Maritime Museum.

Adamantas is the cultural and commercial centre of the island.