Tsibirin Bougainville ( Tok Pisin : Bogenvil ) babban tsibiri ne a Yankin Bougainville cikin Papua New Guinea, wanda kuma aka fi sani da Lardin Bougainville. Wurin shi ne babban yankin Daular Jamus - wacce ke haɗe da arewacin Solomons . Tare da nisan zango-hudu zuwa ɗari biyar da ta raba tsibirin Buka (c.500)   km 2 ) fadin kasar ta takai 9,300   km 2 (3591 kilomita mil). Yawan jama'ar lardin ya kai 234,280 (ƙididdigar shekarar 2011), wanda ya ƙunshi kananan tsibirai kamar Carterets . Dutsen Balbi a kan babban tsibirin a 2,715m shine mafi tsayi. Buka, duk da sirantarsa, ba shi da gada; duk da haka, jiragen ruwa ke kai kawo yau da kullun suna aiki tsakanin manyan maɓuɓɓuka a kowane ɗayan kuma Garin Buka yana da babban filin jirgin sama / filin jirgin sama na arewacin. Shi ne mafi girma daga Tsibirin Solomon, mafi yawanci, wanda aka mayar da hankali ne kudu da gabas, suna da ' yanci a siyasance kamar tsibirin Solomon Islands ; daga biyu daga cikin wadannan tsibirin Shortland yana da kasa da 9   km arewa ko arewa maso yamma zuwa Bougainville; su bi da bi kusan 30   km yamma da Choiseul, wani yanki wanda, Poroporo, yana fuskantar Bougainville.