| Yohannan Elias Mellus | |
| Church: | Chaldean Catholic Church |
| Bishop Of: | Bishop of Mardin |
| Predecessor: | Peter Timothy Attar |
| Successor: | Israel Audo |
| Ordination: | September 21, 1856 |
| Consecration: | June 5, 1864 |
| Enthroned: | 1890 |
| Birth Date: | September 19, 1831 |
| Birth Place: | Mardin |
| Death Date: | February 16, 1908 |
| Ended: | February 16, 1908 |
| Death Place: | Mardin |
Mar Yohannan Elias Mellus (or Milos, Milus) (1831–1908) was a Turkish prelate of the Chaldean Catholic Church.
Elias Mellus was born on September 19, 1831, in Mardin. He entered in the monastery of Rabban Hormizd in Alqosh. On September 21, 1856, he was ordained a priest [1] and on June 5, 1864, he was ordained a bishop in Aqra by Patriarch Joseph VI Audo.
Mellus worked from 1874 to 1882 in the Indian city of Thrissur. On behalf of the Chaldean Catholic patriarch Joseph VI Audo, he looked in vain for the reunification of the Catholic faction of Thomas Christians called Syro-Malabar with their sister church, namely the "Patriarchate of Babylon", as the Catholic successor to the ancient catholicate of Seleucia-Ctesiphon.
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. This group gained more than regional significance. 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.