In Egyptian mythology, Duat^{[pronunciation?]} (also Tuat and Tuaut) (also called Akert, Amenthes, or Neter-khertet) is the underworld. The Duat is a vast area under the Earth, connected with Nun, the waters of the primordial abyss. The Duat is the realm of the god Osiris and the residence of other gods and supernatural beings. It is the region through which the sun god Ra travels from west to east during the night, and where he battled Apep. It also was the place where people's souls went after death for judgement, though it was not the full extent of the afterlife. Burial chambers formed touching-points between the mundane world and the Duat, and spirits could use tombs to travel back and forth from the Duat.

What we know of the Duat principally derives from funerary texts such as Book of Gates, Book of Caverns, Coffin Texts, Amduat and the Book of the Dead. Each of these documents fulfills a different purpose and gives a different perspective on the Duat, and different texts can be inconsistent with one another. The texts which survive differ in age and origin, and it is likely that there was never a single uniform interpretation of the Duat.

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