Halia is an Austronesian language of Buka Island and the Selau Peninsula of Bougainville Island, Papua New Guinea.
The phonology of the Halia language:
Diphthong vowel sounds include .
exists, but not as a monophthong.
There are four sets of pronouns. The first set functions as the subject when preceding the verb. Set 2 functions as a subject or object when following the verb. Set 3 is used for inalienable possession. Set 4 is used for alienable possession. There is an inclusive/exclusive first person distinction.
The suffix -e signifies a transitive verb.
In the 1960s Francis Hagai produced a series of liturgies in Halia as part of his work with the Hahalis Welfare Society.