There are many indigenous languages in Bougainville Province, belonging to three language families.
 The languages of the northern end of the island, and some scattered around the coast, belong to the Austronesian family.
The languages of the north-central and southern lobes of Bougainville Island belong to the North and South Bougainville families.

The most widely spoken Austronesian language is Halia and its dialects, spoken in the island of Buka and the Selau peninsula of Northern Bougainville.
Other Austronesian languages include Nehan, Petats, Solos, Saposa (Taiof), Hahon and Tinputz, all spoken in the northern quarter of Bougainville, Buka and surrounding islands.
These languages are closely related.
Bannoni and Torau are Austronesian languages not closely related to the former, which are spoken in the coastal areas of central and south Bougainville.
On the nearby Takuu Atoll a Polynesian language is spoken, Takuu.

The Papuan languages are confined to the main island of Bougainville.
These include Rotokas, a language with a very small inventory of phonemes, Eivo, Terei, Keriaka, Naasioi (Kieta), Nagovisi, Siwai (Motuna), Baitsi (sometimes considered a dialect of Siwai), Uisai and several others.
These constitute two language families, North Bougainville and South Bougainville.

None of the languages are spoken by more than 20% of the population, and the larger languages such as Nasioi, Korokoro Motuna, Telei, and Halia are split into dialects that are not always mutually understandable.
For general communication most Bougainvilleans use Tok Pisin as a lingua franca, and at least in the coastal areas Tok Pisin is often learned by children in a bilingual environment.
English and Tok Pisin are the languages of official business and government.
There are many indigenous languages in Bougainville Province, belonging to three language families.  The languages of the northern end of the island, and some scattered around the coast, belong to the Austronesian family. The languages of the north-central and southern lobes of Bougainville Island belong to the North and South Bougainville families.
The most widely spoken Austronesian language is Halia and its dialects, spoken in the island of Buka and the Selau peninsula of Northern Bougainville. Other Austronesian languages include Nehan, Petats, Solos, Saposa (Taiof), Hahon and Tinputz, all spoken in the northern quarter of Bougainville, Buka and surrounding islands. These languages are closely related. Bannoni and Torau are Austronesian languages not closely related to the former, which are spoken in the coastal areas of central and south Bougainville. On the nearby Takuu Atoll a Polynesian language is spoken, Takuu.
The Papuan languages are confined to the main island of Bougainville. These include Rotokas, a language with a very small inventory of phonemes, Eivo, Terei, Keriaka, Naasioi (Kieta), Nagovisi, Siwai (Motuna), Baitsi (sometimes considered a dialect of Siwai), Uisai and several others. These constitute two language families, North Bougainville and South Bougainville.
None of the languages are spoken by more than 20% of the population, and the larger languages such as Nasioi, Korokoro Motuna, Telei, and Halia are split into dialects that are not always mutually understandable. For general communication most Bougainvilleans use Tok Pisin as a lingua franca, and at least in the coastal areas Tok Pisin is often learned by children in a bilingual environment. English and Tok Pisin are the languages of official business and government.
Bougainville Island