Ali ibn Mohammed al-Jurjani

Ali ibn Mohammed al-Jurjani (1339–1414) (Persian ) was a Persian encyclopedic writer, scientist, and traditionalist theologian. He is referred to as "al-Sayyid al-Sharif" in sources due to his alleged descent from Ali ibn Abi Taleb.

The author of more than fifty books, of his thirty-one extant works, many being commentaries on other works, one of the best known is the Taʿrīfāt (تعريفات "Definitions"), which was edited by Gustav Flügel (Leipzig, 1845), published also in Constantinople (1837), Cairo (1866, etc.), and St Petersburg (1897).