Hausa is a major world language, spoken as a mother tongue by more than 30 million people in northern Nigeria and southern parts of Niger, in addition to diaspora communities of traders, Muslim scholars and immigrants in urban areas of West Africa, e.g. southern Nigeria, Ghana, and Togo, and the Blue Nile province of the Sudan. It is also widely spoken as a second language and has expanded rapidly as a lingua franca. Hausa is a member of the Chadic language family which, together with Semitic, Cushitic, Omotic, Berber and Ancient Egyptian, is a coordinate branch of the Afroasiatic phylum. This comprehensive reference grammar consists of sixteen chapters which together provide a detailed and up-to-date description of the core structural properties of the language in theory-neutral terms, thus guaranteeing its on-going accessibility to researchers in linguistic typology and universals.