John bin Huwai (Arabic: جَوْن ٱبْن حُوَيّ), also spelled John bin Huwayy, was a Nubian Christian freedman who died in battle as part of Husayn ibn Ali's army at the Battle of Karbala on Muharram 10, 61 AH (680 AD).
When Abu Dharr was exiled from Medina by Uthman ibn Affan, Jawn went to Ali ibn Abi Talib who invited him to stay on as his companion.
On the night before Ashura, Imam urged Jawn to go away to seek his safety by telling him "You have accompanied us all the way but now you may go" to that Jawn replied "how is it fair that I benefit from your company and hospitality but abandon you in your hardship?"
At mid-day, after the Zuhr prayers, Jawn came to Husayn, and stood silently.
Jawn fell from his horse, he still continued to fight with his tongue by reciting the poem.