Dhul-Nun al-Misri (ذو النون المصري; born in 796 in Akhmim, Upper Egypt - 859) was an Egyptian Sufi saint. He was considered the Patron Saint of the Physicians in the early Islamic era of Egypt, and is credited with having introduced the concept of Gnosis into Islam. Full name is; Dhul-Nun Abu Faid Thawban ibn Ibrahim أبوالفيض ثوبان بن إبراهيم.
Dhul-Nun, literately "Of the Nun", is a name that is also given to Jonah in Islamic folklore, as "nun" in ancient Arabic meant "big fish"/"whale", as it did in Aramaic where it also means "snake" (see also Nun (Bible) and Nun (letter)).
His nickname al-Misri means 'the Egyptian', a name apparently given to him by his fellows who were not themselves of Coptic decent as he was, or during his travels outside of Egypt.
A legendary alchemist and thaumaturage, he is supposed to have known the secret of the Egyptian hieroglyphs. His sayings and poems, which are extremely dense and rich in mystical imagery, emphasize knowledge or gnosis (marifah) more than fear (makhafah) or love (mahabbah), the other two major paths of spiritual realization in Sufism. None of his written works have survived, but a vast collection of poems, sayings, and aphorisms attributed to him continues to live on in oral tradition.