Abu Nasr Khusrau Firuz

Al-Malik al-Rahim
Buyid Emir of Iraq
Reign	1048–1055
Predecessor	Abu Kalijar
Successor	Seljuq conquest
Died	1058 or 1059 Ray
Issue	Abu'l-Ghana'im al-Marzuban
House	Buyid
Father	Abu Kalijar
Religion	Shia Islam

Abu Nasr Khusrau Firuz (Persian: ابونصر خسرو فیروز‎, died 1058 or 1059), better known by his laqab of Al-Malik al-Rahim (Arabic: الملک الرحیم‎, "the merciful king") was the last Buyid amir of Iraq (October 1048 – 1055). He was the son of Abu Kalijar.

Upon his father's death, he took the throne in Baghdad with the title "al-Malik al-Rahim". His succession to the entire Buyid Empire was prevented by his brother Abu Mansur Fulad Sutun, who took control of Fars. The two then entered into a struggle for supremacy. During this period Al-Malik al-Rahim appointed the Fasanjas Ala al-Din Abu'l-Ghana'im Sa'd as his vizier. In 1049, Al-Malik al-Rahim sent an army under his brother Abu Sa'd Khusrau Shah, who managed to capture Shiraz and also capture Abu Mansur.

However, Abu Sa'd Khusrau was shortly forced back to Iraq due to increased hostility between the Turks and the Dailamite troops there. At about the same time, the Buyid lands in Oman were permanently lost. Abu Mansur then managed to become the ruler of Fars once again, and captured parts of Ahvaz from Al-Malik al-Rahim. Al-Malik al-Rahim, however, managed to recapture Ahvaz and seize another town named Askar Mukram from Abu Mansur. The next year, a combined army of Arab and Kurdish tribes, ravaged Ahvaz and its surrounding regions, but were later repelled by Al-Malik al-Rahim.

In 1051 or 1052, Al-Malik al-Rahim once again defeated Abu Mansur and captured Fars. He then appointed Abu Sa'd Khusrau Shah, as governor of the province. Shiraz, however was lost in 1053 or 1054, when Abu Mansur returned as a vassal to the Seljuk ruler Toghrül. In 1055, a Dailamite military leader named Fuladh, captured Shiraz and repelled Abu Mansur from Fars.

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