Siau Island

{{Short description|Island in Indonesia}}

Siau is an island in North Sulawesi, Indonesia, located in the Sangir Archipelago approximately {{convert|130|km|mi|abbr=on}} off the northern tip of Sulawesi in the Celebes Sea. Covering a land area of 160 km², it is the main island of the Sitaro Islands Regency of North Sulawesi Province.

File:COLLECTIE TROPENMUSEUM Bewoners van het eiland Siaoe poseren voor een decor in een fotostudio TMnr 10005699.jpg

The northern part of the island forms the volcano known as Karangetang (Api Siau), which is one of Indonesia's most active volcanoes.

The population of Siau island was 40,758 at the 2010 CensusBiro Pusat Statistik, Jakarta, 2011. and 45,804 at the 2020 Census;Badan Pusat Statistik, Jakarta, 2021. the official estimate as at mid-2023 was 46,459.Badan Pusat Statistik, Jakarta, 28 February 2024, Kabupaten Kepulauan Siau Tagulandang Biaro Dalam Angka 2024 (Katalog-BPS 1102001.7109) The island has been noted as the home of the Siau Island tarsier.