The sky often has important religious significance. Many religions, both polytheistic and monotheistic, have deities associated with the sky.

Sky deity

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The daytime sky deities are typically distinct from the nighttime ones. 

 reflects this by separating the category of "Sky-god" (A210) from that of "Star-god" (A250). In mythology, nighttime gods are usually known as night deities and gods of stars simply as star gods. Both of these categories are included here since they relate to the sky. Luminary deities are included as well since the sun and moon are located in the sky. Some religions may also have a deity or personification of the day, distinct from the god of the day lit sky, to complement the deity or personification of the night.

Daytime gods and nighttime gods are frequently deities of an "

 or "celestial world" opposed to the earth and a "

" (gods of the underworld are sometimes called "chthonic" deities).

 Within Greek mythology, Uranus was the primordial sky god, who was ultimately succeeded by 

. Such king gods are collectively categorized as "

" deities, with a polarity between sky and earth often being expressed by pairing a "sky father" god with an "

 are less frequent). A main sky goddess is often the queen of the gods and may be an air/sky goddess in her own right, though she usually has other functions as well with "sky" not being her main. In antiquity, several sky goddesses in ancient Egypt, Mesopotamia, and the Near East were called 

. Neopagans often apply it with impunity to sky goddesses from other regions who were never associated with the term historically.

Gods may rule the sky as a pair (for example, 

 The following is a list of sky deities in various polytheistic traditions arranged mostly by language family, which is typically a better indicator of relatedness than geography.

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