Svarog is a Slavic god of fire and blacksmithing, who was once interpreted as a sky god on the basis of an etymology rejected by modern scholarship. He is mentioned in only one source, the Primary Chronicle, which is problematic in interpretation. He is presented there as the Slavic equivalent of the Greek god Hephaestus. The meaning of his name is associated with fire. He is the father of Dazhbog and Svarozhits.

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