Schoinoussa or Schinoussa (Greek: Σχοινούσσα pronounced [sçiˈnusa]; anciently Σχινοῦσσα) is an island and a former community in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Naxos and Lesser Cyclades, of which it is a municipal unit. It lies south of the island of Naxos, in the Lesser Cyclades group, between the island communities of Irakleia and Koufonisia. The population was 229 inhabitants at the 2021 census. Its land area is 8.512 square kilometres (3.29 sq mi).

Schoinoussa is located south of Naxos, in the middle about of the Lesser Cyclades island group. It is the fourth largest island of the Lesser Cyclades and the second most populated, after Ano Koufonisi. The island has three settlements, Chora the capital of the island, Mesaria and Mersini which is the port of the island. The derivation of the name Schinoussa is not precisely known. It is believed that the name either derives from the corruption of the ancient name Echinousa or from a Venetian nobleman named Schinoza. Schoinoussa has been inhabited since antiquity. On the island there are sites of archaeological interest including ancient Greek and Roman ruins, ruins of a Byzantine church and a small medieval castle. From the 11th century, the island was the property of the Hozoviotissa Monastery on the nearby island of Amorgos.

Year	Population
2001	206
2011	256
2021	229

According to the National Observatory of Athens, Schoinoussa has a hot semi-arid climate (Köppen climate classification: BSh). Schoinoussa records the lowest average annual precipitation in Greece with around 240 mm, missing the hot desert climate (Köppen climate classification: BWh) by less than 50 mm. The area has very mild winters and hot summers.

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  Chora village on Schoinoussa
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  The beach of Livadi
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  Traditional windmill-church in Schoinoussa
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  Schoinoussa and neighbouring islands

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