Dhia'a Al- Malik Bin Nizam Al- Malik AL- Tusi (d. 544 AH/ 1149 AD) Minister of the Abbasid caliphate and the Seljuk sultan.

Dhia' Al malk ben Nitham Al malik is a character of great role in Saljuki state history. He was a minister at Saljuki Sultan Mohamed ben malkshah, then a minister at Abbasid kalif Al-Mustarshid Billah .His greatest achievement as a minister of Saljuki sultan was fighting Batniya , a movement who assassinated his father Nidhamulmulk Al-Toussi and tried killing him later after Dhia raged a military campaign against that movement . Saljuki sultan removed him from office to be reassigned again as a minister for Abbasid kalif Al-Mustarshid Billah after an advice from kalifs advisor Shamsuldeen Bin Nidhamulmulk who happened to be Dhias brother Another important event is raging a war against Duyees Bin Saifuldolah Sadaka and put plans for Abbasid kalif to follow to conquer Duyees Bin Saifuldolah Sadaka .