This volume contains a detailed grammatical description of the Omani dialect of Mehri, an unwritten Semitic language of the Modern South Arabian group. It is the first complete grammar of any Modern South Arabian language in a hundred years, and the first ever Mehri grammar based on the Omani dialect, making it an important contribution to the field of Semitic studies in general. Topics in phonology, all aspects of morphology, and a variety of syntactic features are covered in this volume. The grammar is based on texts collected by T.M. Johnstone, and published by H. Stroomer.