Hyow is an undocumented language, with about four thousand speakers living in the southeast of Bangladesh. This dissertation describes the linguistic features of this undocumented language. This dissertation consists of twelve chapters, a text, a Hyow-English dictionary, three appendices and references. The first chapter of this grammar contains an introductory discussion of the land, life and language of Hyow. An attempt has been made to work out the genetic relation of Hyow with other Kuki-Chin languages in this chapter. The second chapter includes the description of phonetics and phonology, which addresses the vowel and consonant inventory, phonotactics, acoustic analysis, phonological processes and tone sandhi among other topics. The th...