Trung is a Tibeto-Burmna (Trans-Himalayan) language spoken by some 13,000 people in northwestern Yúnnán, north of Burma and east of Tibet, mainly in the Trung valley. Four regional varieties of the language have been distinguished. This grammar, based on linguistic research conducted on the language from 2008 until 2017, is the most detailed account of the language to date, including a corpus of phonologically transcribed, morphologically analysed and translated native Trung texts as well as a Trung-English-Mandarin dictionary.