Muzaffar ibn Kaydar (Arabic: مظفر بن كيدر)[1] was a ninth-century governor of Egypt for the Abbasid Caliphate.
Muzaffar was initially appointed to head the security (shurtah) of Egypt by his father Kaydar Nasr ibn 'Abdallah, after the latter was made governor of the province in 832.
He immediately moved to put down a revolt, led by Yahya ibn al-Wazir al-Jarawi, which had broken out during his father's lifetime, and defeated the rebels in a battle near Tinnis.
[3] His activities regarding the mihnah, then underway in the provinces of the caliphate, are subject to debate; Ibn Taghribirdi reported that he tested the 'ulama' on the createdness of the Qur'an,[4] but this may be a doublet of events that occurred during his father's governorship.
[5] In the summer of 834, the Turkish general Ashinas was granted the oversight of Egypt by al-Mu'tasim, and his name was mentioned in the prayers throughout the province.