This book provides a full grammatical description of Papapana, a previously undocumented and under-described endangered Oceanic language of Bougainville, Papua New Guinea. This is the first grammar of Papapana and indeed any Oceanic language of Bougainville. The grammatical description is related to current typological and Oceanic linguistic research and highlights language contact phenomena, situating Papapana within its sociohistorical context.