Ios took its name in antiquity from the word Ia, the flowers that rose abundantly on the island. In modern times, the islanders of the Cyclades and the inhabitants of Ios call the island, Nio, a name that dates from the Byzantine era.

From prehistoric times and thanks to its safe natural harbor, Ios played an important part on the sea roads to Crete.

Ios was found under the influence of the Minoan and then of the Mycenaean civilization. An important Mediterranean people, the Phoenicians, seem to have been arrived on the island and maintained their presence until the 9th century BC. Ios is Ionic from one point onwards, since it belongs to Ionic Amphictyonia.

Ios had a great presence and was a strong city in the classical and Hellenistic times. A small recovery comes for Ios at the time of the Duchy of Naxos, but the Ottoman domination interrupts it.

Although Ios did not have a strong naval force, it was one of the first islands to raise the revolutionary flag in 1821. Ios took part in the naval battle at Kusadasi on July 9, 1821, as well as in the Second National Assembly in Astros in 1823 and in the Third National Assembly of Troizina in 1827.

Since 70’s, the island has begun to emerge in a new era, as it is increasingly becoming a popular tourist destination for young people in Europe. Today Ios retains its reputation as the island of youth and entertainment, but also has excellent tourist infrastructure, organized marina at its harbor and good enough road network. Which puts it with the best in the new era.