Tamambo is a previously undescribed language of northern Vanuatu, now spoken by approximately 4000 people. It is a conservative Oceanic language, reflecting many of the consonant phonemes posited for Proto Oceanic (POc); lexically, many Tamambo words are reflexes of those posited for POc. This is a grammatical description of Tamambo; it is a nominative-accusative language, and is primarily head-marking.

The description includes analysis of the considerable derivational morphology, possessive constructions, serial verb constructions, and an animacy hierarchy that interrelates with various aspects of the grammar. Five texts from various oral genres are included.