| Yahya ibn Abi Mansur | |
| Native Name: | یحیی ابن ابی منصور |
| Native Name Lang: | ar |
| Death Date: | 830 |
| Death Place: | Aleppo |
| Era: | Islamic Golden Age |
| Main Interests: | Astronomy, astrology |
Yahya ibn Abi Mansur (Arabic: یحیی ابن ابی منصور), also called Bizist, son of Firuzan (Persian: بزیست فیروزان; d. 830) was a senior Persian official from the Banu al-Munajjim family, who served as an astronomer and an astrologer at the court of Abbasid caliph al-Ma'mun. Since his father Abu Mansur Aban was an astrologer in service of caliph al-Mansur, it can be concluded that Yahya spent his childhood in Baghdad.
Yahya ibn Abi Mansur's first known position was as an astrologer for al-Fadl ibn Sahl, vizier of the caliph al-Ma'mun. After the assassination of al-Fadl, Yahya converted to Islam and adopted his Arabic name. He is associated with the House of Wisdom, and is mentioned as a teacher of the Banu Musa. He died near Aleppo in 830.