A Grammar of Nungon is the most comprehensive modern reference grammar of a language of northeast Papua New Guinea. Nungon is a previously-undescribed Finisterre-Huon Papuan language spoken by about 1,000 people in the Saruwaged Mountains, Morobe Province. Hannah Sarvasy provides a rich description of the language in its cultural context, based on original immersion fieldwork. The exposition is extraordinarily thorough, covering phonetics, phonology, word classes, morphology, grammatical relations, switch-reference, valency, complex predicates, clause combining, possession, information structure, and the pragmatics of communication. Four complete interlinearized Nungon monologues and dialogues supplement the copious textual examples. A Grammar of Nungon sets a new standard of thoroughness for reference works on languages of this region.