| Harun ibn Khumarawayh هارون بن خمارويه | |
| vassal Ruler of Egypt | |
| Reign: | 896–904 |
| Reign-Type: | Rule |
| Predecessor: | Jaysh ibn Khumarawayh |
| Successor: | Shayban ibn Ahmad ibn Tulun |
| House: | Tulunid |
| Father: | Khumarawayh ibn Ahmad ibn Tulun |
| Birth Place: | Egypt |
| Death Date: | 30 December 904 |
| Death Place: | Egypt |
| Religion: | Islam |
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 Thughūr; 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. Over the next few years, the Tulunid domains continued to experience domestic turmoil coupled with an escalation of Qarmatian attacks, resulting in the defection of many Tulunid followers to the resurgent Caliphate.
The Abbasid Caliphate took advantage of this state of affairs and invaded Tulunid-controlled Syria in 904. The Tulunid troops deserted, and the forces of the Caliphate were able to enter the Nile valley. Harun was killed in an army mutiny. His successor was the last of the Tulunids, his uncle Shayban (904–905).