Gioura (Greek: Γιούρα) is a Greek island and an abandoned settlement in the eastern part of the Sporades. It is administratively part of the municipality of Alonnisos. The island name dates back to the ancient times as Gerontia. The name was later altered to Gioura. The island also features a Neolithic settlement. The 1991 census read one inhabitant making it the smallest municipal district in Greece in population.