Harun ibn Khumarawayh (Arabic: هارون بن خمارويه; died 30 December 904) was the fourth Tulunid vassal Emir of Egypt (896–904).

He succeeded his elder brother Abu 'l-Asakir Jaysh, who had been murdered by army chiefs.

He left state affairs to the vizier, Abu Ja'far ibn Ali, preferring to live a life of dissolute luxury.

This led to a growing crisis in the country, since state finances could not be regulated and the army leaders gradually accrued more power to themselves After Khumarawayh's death, the Tulunids entered a period of instability under his under-age heirs, with his son Jaysh ibn Khumarawayh being deposed and killed in November, in favour of his younger brother Harun ibn Khumarawayh (896–904).

al-Mu'tadid swiftly took advantage of this: in 897 he extended his control over the border provinces of the al-Thughur; forced the Tulunids to hand back all of Syria north of Homs; and increased the annual tribute to 450,000 dinars in exchange for caliphal recognition of Harun.