Abu Musa Utamish (Arabic: اوتامش، اتامش) (died June 6, 863) was a Turkic military officer of the Abbasid Caliphate.
[5][6] In any case, al-Mutawwakil's killing resulted in al-Muntasir becoming caliph; during his short reign (861–862), Utamish and the vizier Ahmad ibn al-Khasib were among the most prominent men in his government.
[8] Utamish seems to have held a strong influence on al-Musta'in and became one of the most powerful individuals in the new administration; he was appointed as vizier and given control over the treasury, and additionally received the governorships of Egypt and the Maghrib.
[11] Over the course of the first year of al-Musta'in's reign, Utamish enjoyed full control over the caliph and his affairs;[11] in the opinion of the historian Dominique Sourdel, he was "un véritable régent de l'empire."
Utamish also excluded the influential officers Bugha al-Sharabi and Wasif al-Turki from power, and the two retaliated by plotting his downfall.