Mar Yohannan Elias Mellus (or Milos, Milus) (1831–1908) was a Turkish prelate of the Chaldean Catholic Church.

The experiment resulted in a schism: some of the followers of Mellus left the Chaldean Catholic Church and joined the Chaldean Syrian Church in 1894/1909.

In 1968 their metropolitan, Mar Thomas Darmo, opposed Assyrian Patriarch Mar Shimun XXI Eshai and formed the Ancient Church of the East.

In 1882 Mar Elias Mellus was suspended from his office of bishop and returned to Mosul.

After some hesitation he fully reentered in the Chaldean Catholic Church in 1890 and was appointed Bishop of Mardin, the position in which he died on February 16, 1908.