A Grammar of Mongsen Ao presents the first comprehensive grammatical description of a language spoken in Nagaland, north-east India. The languages of this region remain under-documented for a number of historical reasons. This book will be of value to any linguist seeking to clarify genetic relationships within the Tibeto-Burman family, and it will serve more broadly as a reference grammar for typologists interested in the typological features of a Tibeto-Burman language of north-east India.