Abu'l-Husayn al-Qasim ibn Ubayd Allah () was a senior official of the Abbasid Caliphate who served as vizier from April 901 until his own death in October 904.
Hailing from the Banu Wahb, a family of Nestorian Christian origin that had served in the caliphal bureaucracy since late Umayyad times, al-Qasim was the son and grandson of viziers. He had served as aide to his father, Ubayd Allah ibn Sulayman, during the latter's decade-long vizierate, and then succeeded him upon his death, heading the government during the last months of the reign of al-Mu'tadid () and the early years of al-Muktafi (). Al-Qasim largely dominated the young al-Muktafi, who awarded him the title of Wali al-Dawla () and gave one of his daughters to one of al-Qasim's sons.
Unlike his father, who was widely esteemed for his honesty and justice, al-Qasim was corrupt and cruel, ordering the executions of anyone that displeased him or presented a potential challenge, such as the Saffarid emir Amr ibn al-Layth, the general Badr al-Mu'tadidi, or the poet Ibn al-Rumi. The powerful finance secretary Ali ibn al-Furat was saved from a similar fate only by al-Qasim's illness and death. This death meant the end of the Banu Wahb's hold on power, which now passed to the Banu'l-Furat. Only a generation later would al-Qasim's sons al-Husayn and Muhammad also rise to become viziers.
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