Atum, sometimes rendered as Atem or Tem, is the primordial god in Egyptian mythology from whom all else arose. He created himself and is the father of Shu and Tefnut, the divine couple, who are the ancestors of the other Egyptian deities. Atum is also closely associated with the evening sun. As a primordial god and as the evening sun, Atum has chthonic and underworld connections. Atum was relevant to the ancient Egyptians throughout most of Egypt's history. He is believed to have been present in ideology as early as predynastic times, becoming even more prevalent during the Old Kingdom and continuing to be worshiped through the Middle and New Kingdom, though he becomes overshadowed by Re around this time.

Egyptian mythology is the collection of myths from ancient Egypt, which describe the actions of the Egyptian gods as a means of understanding the world around them. The beliefs that these myths express are an important part of ancient Egyptian religion. Myths appear frequently in Egyptian writings and art, particularly in short stories and in religious material such as hymns, ritual texts, funerary texts, and temple decoration. These sources rarely contain a complete account of a myth and often describe only brief fragments.