Matbat is a heavily Papuan-influenced Austronesian language spoken in West Papua, Indonesia, on the island of Misool, Raja Ampat islands.

[2]: 17  Similar to the neighboring Ma'ya language, Matbat is one of a handful of Austronesian languages with true lexical tone rather than a pitch-accent system or complete lack of phonemic tonal contrasts as with most other Austronesian languages.

[3] Matbat is spoken in the following locations within Raja Ampat Regency:[4] The phonology of the Matbat language is summarized below:[5] /j/ can be heard freely as [ʝ] or [ɟ] in word-initial position.

Examples of some of the longer monomorphemic words are /kamow˩˨/ 'star', /wuj˦te/ 'sea shore', /sapu˥˩luj˩˨/ 'round', /bim˦bom˩˨˩pu/ 'butterfly'.

Some Matbat reflexes of Proto-Malayo-Polynesian (PMP) proto-forms are listed below.