Abdallah ibn Ishaq ibn Ibrahim (Arabic: عبد الله بن إسحاق بن إبراهيم) was a Mus'abid official in the service of the Abbasid Caliphate.
Abdallah was a member of the Mus'abid family, a collateral branch of the Tahirid dynasty.
Following the death of Muhammad ibn Ishaq ibn Ibrahim in July 851, 'Abdallah succeeded him as governor of Baghdad and chief of security (shurtah) of the Sawad, but he quickly alienated his taxation officials by dealing with them in a harsh manner.
863 Abdallah was appointed by Muhammad to act as his governor of Fars.
Lacking the means to counter the revolt, Abdallah was forced to abandon Fars and return to Baghdad.