| Mar Shimun XVIII Rubil | |
|---|---|
| His Holiness | |
| Church | Assyrian Church of the East |
| Diocese | Patriarchal Diocese of Qodshanis |
| See | Apostolic See of Seleucia-Ctesiphon |
| Enthroned | 1860 |
| Reign ended | 1903 |
| Predecessor | Shimun XVII Abraham |
| Successor | Shimun XXI Benyamin |
| Orders | |
| Rank | Catholicos-Patriarch |
| Personal details | |
| Born | Qodshanis, Hakkari |
| Died | 1903 Qodshanis, Hakkari |
| Nationality | Assyrian (Ottoman) |
| Denomination | Christian, Assyrian Church of the East |
| Residence | Qodshanis, Hakkari |
Mar Shimun XVIII Rubil (also Simon XVIII Rouel or Rowil) was Patriarch of the Assyrian Church of the East from 1860 to 1903 succeeding Shimun XVII Abraham. He led the church from Qodshanis, in southeastern Turkey.
The Catholicos Patriarch died on March 16, 1903 and was succeeded by Shimun XXI Benyamin.
| Preceded by Mar Shimun XVII Abraham |
Catholicos-Patriarch of the Church of the East 1860–1903 |
Succeeded by Mar Shimun XXI Benyamin |