Ios is a Greek island in the Cyclades group in the Aegean Sea. It is a hilly island with cliffs down to the sea on most sides, situated halfway between Naxos and Santorini. Ios is part of the Thira regional unit. It was the setting for the movie Ginger and Cinnamon (Dillo con parole mie). Also, scenes from the film Big Blue (Le Grand Bleu) were shot in Manganari.

Ios attracts a large number of young tourists, many of whom used to sleep on their sleeping bags during the 1970s on the popular beach of Mylopotas after partying through the night. Today Mylopotas beach has been developed to an equivalent mass package tourism resort like Platys Gialos and Paradise Beach of Mykonos.