This monograph presents the unified orthography for the Kenyan and Tanzanian Maa varieties of the Nilotic family. They include Maasai, Samburu, Ilchamus, Arusa, Parakuyo and Kisongo. Whilst it is acknowledged that there is a considerable body of literature in these varieties including grammar books, such as Tucker and Mpaayie (1955), Hollis (1905), dictionaries by Mol (1972, 1996) and Payne (2010), PhD and MA theses and story books and the Holy Bible, the orthography used so far has not been scientifically harmonised. This text presents a systematic and consistent orthography and other writing conventions based on linguistically valid principles.