| Region: | Shiraz |
| Era: | early Timurid period |
| Al-Sharif al-Jurjani | |
| Birth Date: | 1339 CE |
| Birth Place: | Ṭāḡu near Astarabad in Gorgān[1] |
| Death Date: | 1414 CE |
| Death Place: | Shiraz |
| Religion: | Islam |
| Denomination: | Sunni |
| Jurisprudence: | Hanafi |
| Creed: | Ash'ari |
| Main Interests: | Kalam((arabic grammar)) (Islamic theology), Mantiq (logic), Falkiat |
| Notable Works: | Jurjani Definitions, Sharh al-Mawaqif |
| Influences: | Abu Mansur al-Maturidi, Abu Hasan al-Ash'ari,[2] Adud al-Din al-Iji,[3] Akmal al-Din al-Babarti |
| Influenced: | Shams al-Din al-Fanari, Ali Qushji |
Ali ibn Mohammed al-Jurjani (1339–1414) (Persian) was a Persian[4] 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.[1] He was born in the village of Ṭāḡu near Astarabad in Gorgan (hence the nisba "Jurjani"),[1] and became a professor in Shiraz. When this city was plundered by Timur in 1387, he moved to Samarkand, but returned to Shiraz in 1405, and remained there until his death.
The author of more than fifty books,[5] of his thirty-one extant works, many being commentaries on other works, one of the best known is the Taʿrīfāt (تعريفات "Definitions"),[6] which was edited by G Flügel (Leipzig, 1845), published also in Constantinople (1837), Cairo (1866, etc.), and St Petersburg (1897).