The Mother of Apis inscriptions (534-41 BC), found in 1966-71 in and outside the Mother of Apis Catacomb at North Saqqara by the Egypt Exploration Society, comprise the stelae and graffiti of the masons who constructed the catacomb and of the priests who oversaw the work and conducted the burial and other rituals for the cows. The texts include genealogies of the masons and some accounts of their work and rations. As well as their scientific importance for the understanding of Egyptian sacred animal cults, social life and chronology, they have a strong human interest. This study includes transliterations, translations and explanatory notes on all the texts found, together with commentaries and indexes.