Mar Denha, also Mar Denha I was Patriarch of the Church of the East (sometimes referred to as the Nestorian church) from 1266 until his death in 1281, when he was replaced by Mar Yaballaha III. He had succeeded Mar Makkikha II. Later, Mar Denha charged the monks to return to China as his messengers. However, their departure was delayed due to armed conflict along the route. When Mar Denha died, Markos was elected as his successor.