Scientific analysis of samples takes from metal objects and metallurgical products excavated during the 1960s at Kastri on Kythera provide new evidence concerning, variously, the Aegean metals trade and metallurgy on Kythera. The samples date to the Second Palace (Neopalatial), Classical and Late Roman periods. The Bronze Age material comprises fragments of copper ingots and silver cups, neither of which metal is locally available in Kythera, and the later material relates largely to local smelting and possibly smithing of iron, whose origin is uncertain. These activities are related to preliminary information concerning the distribution at each period of metallurgical activity across the island that has been generated by the intensive surface survey of the Kythera Island Project.