Rabban Mar Hormizd (Classical Syriac: ܕܪܒܢ ܗܘܪܡܙܕ) was a monk who lived in the seventh century in modern northern Iraq.

[2] He founded the Rabban Hormizd Monastery in Alqosh, named after him, which has served in the past as the patriarchate of the Church of the East.

[3] According to The histories of Rabban Hormizd the Persian and Rabban Bar-Idta, a text written by his disciple Simon[4] before the 12th century,[5] Hormizd was born at the end of the sixth or beginning the seventh century at Beth Lapat (in Sassanid ruled Assyria) from a rich or noble family, and at the age of eighteen he started to travel towards Scetes to become a monk there.

When Hormizd was sixty-five or sixty-six, he left the monastery and passing out of the country of Marga went and settled down in the mountain of Beth 'Edhrai near the Assyrian town of Alqosh.

The following part of the life of Rabban Hormizd is marked by episodes in which the saint opposed the miaphysite monks of the Mar Mattai Monastery.