Harmala ibn Kahil () was an archer at the Umayyad side at the Battle of Karbala. He was the killer of Ali al-Asghar ibn Husayn, the great-grandchild of Muhammad, on 10 October, 61 AH (680 CE).
When Imam Al-Husayn had lost all hope against the enemy at the Battle of Karbala, he came out riding on a horse and asked for water for his six months old child Ali al-Asghar who was dying of thirst. Hurmala sent a three-headed arrow flying into the little child's throat.