The Sultan Mahmud Dam, locally called Band-e Sultan (), is an embankment dam located on the Ghazni River in the Jaghatu District of Maidan Wardak Province in eastern Afghanistan. It has importance for residents of both Maidan Wardak and neighboring Ghazni Province. Its reservoir has the capacity to irrigate around of agricultural land.
The Sultan Dam was built during the Ghaznavids era in the 10th century, in memory of Sultan Mahmud of Ghazni. It has the potential to meet electricity needs of 50,000 families.
The barrage collapsed in March 2005, leading to catastrophic flooding of the city of Ghazni, which is located about to the south. The Sultan Dam attracts many tourists, particularly locals and residents of nearby provinces.