Dihya ibn Khalifa al-Kalbi (Arabic: دِحْيَة ٱبْن خَلِيفَة ٱلْكَلْبِيّ, Diḥya al-Kalbī), sometimes spelled Dahyah, was the envoy who delivered the Islamic prophet Muhammad's message to the Roman Emperor Heraclius.

Two similar narrations have been recorded through Abu Uthman in Sahih al-Bukhari that reports an incident witnessed by Muhammad's wife Umm Salama: A hadith attributed to Abu 'Uthman reports:[2]

He was attacked during the Expedition of Zayd ibn Harithah (Hisma) Dihya approached the Banu Dubayb (a tribe which converted to Islam and had good relations with Muslims) for help.

When the news reached Muhammad, he immediately dispatched Zayd ibn Harithah with 500 men to punish them.

The Muslim army fought with Banu Judham, killed several of them (inflicting heavy casualties), including their chief, Al-Hunayd ibn Arid and his son, and captured 1000 camels, 5000 of their cattle and 100 women and boys.