In ancient Egyptian mythology Nun is the personification of the primeval waters from which everything else arose. Additionally, the sun emerges each day from Nun, renewed and regenerated. Due to the Egyptian reverence for the Sun (Re) as the primary diety, Nun is known as the father of the gods.

Also had female counterpart, Nuanet. With her they formed the first generation of the family group of eight gods, known as the Ogdoad of Hermopolis.

When depicted in human form, Nun was sometimes shown with a frog's head. Due to his status as creation god, the annual flooding of the Nile was associated closely with Nun/Nuanet.