Fakhr al-Din Masud (Persian: فخر الدین مسعود), was the first ruler of the Ghurid branch of Bamiyan, ruling from 1152 to 1163.
In order to avenge his brother, Sayf marched towards Ghazna in 1148, and scored a victory at the Battle of Ghazni while Bahram fled to Kurram.
After Sayf's death, he was succeeded by his brother Baha al-Din Sam I, who continued building Firuzkuh, and prepared an army to march towards Ghazna to avenge the death of his two brothers, but died shortly of natural causes before he reached the city.
He, along with Fakhr al-Din Masud, shortly avenged their brothers by brutally sacking Ghazna.
Ghiyath managed to kill the Seljuq governor during the battle, and then conquered Zamindawar, Badghis, Gharchistan, and Guzgan.