Abu Tahir Firuz Khusrau (Persian: ابوطاهر فیروزخسرو), better known by his laqab of Jalal al-Dawla (993 or 994 – March 1044), was the Buyid amir of Iraq (1027–1044).
Jalal al-Dawla, with the aid of his vizier Abu Sa'd Abd al-Wahid, tried to capture Baghdad, but was shortly repelled by a Buyid army which had taken control of the city.
In 1030, Jalal al-Dawla sent a fleet of 1300 ships under his vizier Abu Ali Hasan to capture Basra, but the expedition was a disaster and ended in a complete defeat.
Jalal al-Dawla was however also forced to deal with problems in his own realm, which consisted of little more than Baghdad and Wasit following Abu Kalijar's seizure of Basra.
His army was continually hostile, a situation which devolved to the point where the Abbasid caliph often acted as a mediator between the amir and his troops.