Sulawesi (/ˌsləˈwsi/), also known as Celebes (/ˈsɛlɪbz, sɪˈlbz/), is one of the four Greater Sunda Islands. It is governed by Indonesia. The world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Archipelago. Within Indonesia, only Sumatra, Borneo and Papua are larger in territory, and only Java and Sumatra have larger populations.

Provincial division of Sulawesi
Topographic map of Sulawesi
Coordinates02°S 121°E
ArchipelagoGreater Sunda Islands
Area180,680.7 km2 (69,761.2 sq mi)
Area rank11th
Highest elevation3,478 m (11411 ft)
Highest pointLatimojong
Largest settlementMakassar (pop. 1,423,877)
Population19,896,951 (2020 Census)
Pop. density105.5/km2 (273.2/sq mi)
Ethnic groupsMakassarese, Buginese, Mandar, Minahasa, Gorontalo, Toraja, Butonese, Muna, Tolaki, Bajau, Mongondow

The landmass of Sulawesi includes four peninsulas: the northern Minahasa Peninsula; the East Peninsula; the South Peninsula; and the Southeast Peninsula. Three gulfs separate these peninsulas: the Gulf of Tomini between the northern Minahasa and East peninsulas; the Tolo Gulf between the East and Southeast peninsulas; and the Bone Gulf between the South and Southeast peninsulas. The Strait of Makassar runs along the western side of the island and separates the island from Borneo.