In Norse mythology, Dellingr (Old Norse possibly "the dayspring" or "shining one") is a god. Dellingr is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and in the Prose Edda, written in the 13th century by Snorri Sturluson. In both sources, Dellingr is described as the father of Dagr, the personified day. The Prose Edda adds that, depending on manuscript variation, he is either the third husband of Nótt, the personified night, or the husband of Jörð, the personified earth. Dellingr is also attested in the legendary saga Hervarar saga ok Heiðreks. Scholars have proposed that Dellingr is the personified dawn, and his name may appear both in an English surname and place name as well as German surnames.
Dellingr is referenced in the Poetic Edda poems Vafþrúðnismál and Hávamál. In stanza 24 of Vafþrúðnismá, the god Odin (disguised as "Gagnráðr") asks the jötunn Vafþrúðnir from where the day comes, and the night and its tides. In stanza 25, Vafþrúðnir responds:
In Hávamál, the dwarf Þjóðrœrir is stated as having recited an unnamed spell "before Delling's doors":
In the poem Fjölsvinnsmál, Svipdagr asks "What one of the gods has made so great the hall I behold within?" Fjölsviðr responds with a list of names, including Dellingr. In a stanza of the poem Hrafnagaldr Óðins, the appearance of Dagr, horse, and chariot are described, and Dagr himself is referred to as "the son of Delling."