Abu al-Qasim az-Zayyani or, in full, Abu al-Qasim ibn Ahmad ibn Ali ibn Ibrahim az-Zayyani (1734/35–1833) was a Moroccan historian, geographer, poet and statesman from the Berber zayane tribe in Morocco. He undertook diplomatic missions to the Ottoman court and engineered government attempts to bring tribes under central authority. His writings include several historical accounts of the Ottoman and Alaouite dynasties. Az-Zayyani wrote fifteen works in the field of history and geography. Some authors even consider him the greatest historian of Morocco.