Yahya ibn Ismail al-Mamun () (died 1075) was the second ruler of the Berber Hawwara Dhunnunid dynasty who was king of the Taifa of Toledo between 1043 and 1075.

Biography Yahya ibn Ismail succeeded his father Ismail ibn Dhi'n-Nun in 1043. He died at Córdoba in 1075.

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