Abuʾl-Ṣaqr Ismāʿīl ibn Bulbul (Arabic: أبو الصقر إسماعيل بن بلبل) (844/5–891)[1] was an official of the Abbasid Caliphate during the reign of al-Mu'tamid (r. 870–892), serving as vizier of the Caliphate from 878 to 892.
Although he claimed membership of the Arab Banu Shayban tribe, he was of Persian or Mesopotamian origin.
[1] He rose through the ranks of the Abbasid bureaucracy, becoming head of the diwan of the royal domains, but appears in the sources only in 878, when he was appointed to the highest civil office, that of vizier, by the regent al-Muwaffaq.
[1] Nevertheless, real power in the government resided with al-Muwaffaq's own secretary, Sa'id ibn Makhlad, and it was not until the latter's downfall in 885/6 that Isma'il truly became head of the administration.
[1][3] Isma'il ibn Bulbul had Shi'ite sympathies, and was a determined enemy in al-Muwaffaq's son, the future Caliph al-Mu'tadid (r. 892–902), whose growing political and military power he tried unsuccessfully to neutralize.