Abū'l-Qasim ʿAbd Allāh ibn Muhammad ibn al-Qa'im (Arabic: أبو القاسم عبد الله بن محمد بن القائم) better known by his regnal name al-Muqtadi (Arabic: المقتدي 'the follower'; 1056 – February 1094) was the Abbasid caliph in Baghdad from 1075 to 1094.

He was born to Muhammad Dhakirat, the son of caliph Al-Qa'im, and an Armenian slave girl named Urjuman.

[4] Gohar-A'in arrived on 23 July and was granted an audience on Tuesday, 14 August, during which he handed over a letter requesting Fakhr ad-Dawla's removal.

[4] In 1081, the caliph sent Fakhr ad-Dawla to Isfahan, laden with gifts and over 20,000 dinars, to negotiate marriage with Malik-Shah's daughter.

[3] Malik-Shah was grieving the death of his son Da'ud and did not take part i; the negotiations; rather, Fakhr ad-Dawla went to Nizam al-Mulk.

[4] Eventually, Turkan Khatun agreed to the marriage, but with heavy conditions imposed on al-Muqtadi: in return for marrying the Seljuk princess, al-Muqtadi would pay 50,000 dinars plus an additional 100,000 dinars as mahr (bridal gift), give up his current wives and concubines, and agree to not have sexual relations with any other woman.

[3] By agreeing to Turkan Khatun's terms, Fakhr ad-Dawla was putting al-Muqtadi at a severe disadvantage while also benefitting the Seljuks considerably.

[3] Al-Bundari offers no details about the firing itself but wrote instead that the Seljuks sent representatives to meet the Banu Jahir in Baghdad (rather than in Khorasan).

[4] They were succeeded as viziers by Abu'l-Fath al-Muzaffar, son of the ra'is al-ru'asa', who had previously been "in charge of the palace buildings".

Malik-Shah I arranged a marriage between his daughter and al-Muqtadi, possibly planning on the birth of a son who could serve as both caliph and sultan.

Following the failure of the marriage, the Sultan grew critical of the Caliph's interference in affairs of state, and sent an order for him to retire to Basra.

Eventually, however, the Caliph agreed to let her govern if the khutba was said in the name of her son, and if she did so assisted by a vizier he appointed for her, a condition she saw herself forced to accept.

[6] Obadiah the Proselyte, who lived in Baghdad towards the end of al-Muqtadi's reign, records:[7]Al-Muqtadi told Abu Shuja, his vizier, to mark the Jews dwelling in the city of Baghdad with distinctive dress, and he sought many times to destroy them, but the God of Israel thwarted his intent and hid them from his wrath.

[8] In 1071–72, his father Al-Qa'im sent his wazir Ibn Al-Jahir to ask her hand in marriage, to which demand the Sultan agreed.

In March 1082, Al-Muqtadi sent Abu Nasr ibn Jahir to Malik Shah in Isfahan to ask for her hand in marriage.