Abu Zayd Abd al-Rahman Mohammed al-Jadiri () (born in Meknes, in 1375 and died in Fez, probably in 1416) was the (time-keeper) at the Qarawiyyin Mosque.
He wrote a treatise on the determination of time of day and night, an (verse composition) in 26 chapters and 335 verses, entitled (1391/2), and a calendar adapted to the latitude of Fez, .