Justan I ibn Marzuban (died 960) was the Sallarid ruler of Azerbaijan (957–960).
[1] Unable to establish his rule in the province, Wahusdan returned to Tarum; Justan was recognized as ruler in Azerbaijan, with his brother Ibrahim I ibn Marzuban I made governor of Dvin.
Justan seems to have been interested primarily in his harem, a fact which alienated some of his supporters, although he and Ibrahim successfully put down a revolt by a grandson of the caliph al-Muktafi in 960.
Ibrahim raised an army in Armenia to oppose Ismail, prompting Wahsudan to execute Justan, his mother and Nasir.
Ibrahim was driven out of Azerbaijan by Ismail, but retained his rule in Dvin.