The Sultan Mahmud Dam or Band-e Sultan is a dam located on the in the Jaghatū District of Ghazni Province in Afghanistan. As of April 2013, the dam is just used for irrigating 15,000 hectares of land. It is believed to have the potential to meet electricity needs of 50,000 families. The dam has importance for residents of Ghazni and neighboring Maidan Wardak province. It is believed to be first built during the Ghaznavids era in the 10th century, in memory of Sultan Mahmud of Ghazni.