Abu'l-Husain Ahmad (Persian: ابوالحسین احمد), better known by his laqab of Taj al-Dawla (Arabic: تاج الدولة،, "Crown of the Dynasty"), was the Buyid ruler of Khuzestan during the 980s.
Abu'l-Husain was the son of Adud al-Dawla and a daughter of Manadhar, who was a Justanid king.
This invasion provided Abu'l-Husain with the opportunity to set up his rule in Ahvaz, and took the title of Taj al-Dawla.
Nevertheless, after a few years Sharaf al-Dawla invaded and occupied Khuzestan and Basra, causing the two princes to flee to Fakhr al-Dawla's territory.
Neither of the two brothers managed to found any lasting line; consequently their role in Buyid politics was short.