Nun , in the Hebrew Bible, was a man from the Tribe of Ephraim, grandson of Ammihud, son of Elishama, and father of Joshua. He grew up in and may have lived his entire life in the Israelites' Egyptian captivity, where the Egyptians "made life bitter for them with harsh labor at mortar and bricks and with all sorts of tasks in the field." In Aramaic, "nun" means "fish". Thus the Midrash tells: "[T]he son of him whose name was as the name of a fish would lead them [the Israelites] into the land." (Genesis Rabba 97:3.) Tradition places Nun's tomb near that of his son Joshua who, according to , is buried in Timnat Serah. The similarly named Palestinian village of Kifl Hares/Timnat Hares, located northwest of Ariel in the Samarian region of the West Bank, now encircles both tombs.

Noun est le fils d'Éphraïm. Il appartient naturellement à cette tribu. Son fils est Josué.