Dhu'l-Nun, Dhu'n-Nun or Zu'n-Nun () is an epithet of Jonah in Islam.
It is also a masculine given name. Variants include Zünnûn (in Turkish).
People named Dhu'l-Nun or its variants include: Dhu'l-Nun al-Misri, a 9th-century Sufi Melik Zünnun, a 12th-century Danishmendid ruler Dhu'l-Nun Ayyub (1908–1988), Iraqi novelist
See also Dhunnunid dynasty