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Yahya ibn Muhammad (or Yahya I; died 864) was the fifth Idrisid ruler and sultan of Idrisid dynasty.

A son of previous sultan Idris II, he took over the rule in Morocco after the death of his heirless brother Ali I in 848. During his rule, which saw no significant conflicts, he settled in Fes numerous immigrants from Al-Andalus and Ifriqiya, which had been expelled after revolting against the Umayyad and Aghlabids respectively. He also commissioned several relevant construction in the city, the mosque of Al-Karaouine and of al-Andalus (859).

He died in 864, aged around 35. He was succeeded by his son Yahya II ibn Yahya.

Preceded by Ali I

Idrisid dynasty 848–864

Succeeded by Yahya II