In Egyptian mythology, Shu is the Egyptian god of the atmosphere and of dry winds, son of Ra, brother and husband of Tefnut, father of Geb and Nuit. Represented in hieroglyphs by an ostrich feather (similar to Ma'at's), which symbol he is usually shown wearing on his head. He is generally shown standing on the recumbent Geb, holding aloft his daughter Nuit, separating the two.

It was said that if he ever ceased to interpose himself between earth and sky, life would cease to be on our world - a very accurate assessment, it would seem. The name "Shu" appears to be related to the root "shu" meaning "dry, empty." Shu also seems to be a personification of the sun's light. Shu and Tefnut were also said to be but two halves of one soul, perhaps the earliest recorded example of "soulmates."