Baha al-Din Sam I (Persian: بهاء الدین سام), was the king of the Ghurid dynasty who reigned briefly in 1149.
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.
Sayf fled, but the Ghaznavid army caught up with him and a battle ensued at Sang-i Surakh.
Sayf and Majd ad-Din Musawi were captured and later crucified at Pul-i Yak Taq.
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.