Icaria, also spelled Ikaria (Ικαρία), is a Greek island in the Aegean Sea, 10 nautical miles (19 km) southwest of Samos.
Administratively, Icaria forms a separate municipality within the Ikaria regional unit, which is part of the North Aegean region. The principal town of the island and seat of the municipality is Agios Kirykos. The historic capitals of the island include Oenoe and Evdilos.
According to tradition, it derives its name from Icarus, the son of Daedalus in Greek mythology, who was believed to have fallen into the sea nearby.
Icaria is one of the middle islands of the northern Aegean, in area with of coastline and a population of 8,312 inhabitants. The topography is a contrast between verdant slopes and barren steep rocks. The island is mountainous for the most part. It is traversed by the Aetheras range, whose highest summit is . Most of its villages are nestled in the plains near the coast, with some in the mountains.
Icaria has a tradition of producing strong red wine. Many parts of the island, especially the ravines, are covered in shrubbery, making the landscape lush with green. Aside from domestic and domesticated species such as goats, there are a number of small wild animals to be found, such as martens, European otters, jumping spiders, and green toads. Icaria exhibits a typical Mediterranean climate (Köppen: Csa).
Icaria has been inhabited since at least 7000 BC, when it was populated by the Neolithic Pelasgians, a blanket term used by the ancient Greeks to refer to all pre-Hellenic peoples inhabiting the Greek region. Around 750 BC, Greeks from Miletus colonized Icaria, establishing a settlement in the area of present-day Campos, which later became the ancient capital city of Oenoe. In antiquity, the island was called Icaria or Ikaria (Ἰκαρία), as today; and also Icarus or Ikaros (Ἴκαρος).
Icaria became part of the sea empire of Polycrates during the 6th century BC, and during the 5th century BC, the Icarian cities of Oenoe and Thermae were members of the Athenian-dominated Delian League.