For the language known as Daur or Dagur, see Daur language .

In Norse mythology, Dagr (modern Scandinavian: Dag, modern Icelandic: Dagur) was the god of the daytime, a son of Delling (god of twilight) and Nott (goddess of night). He drove across the sky in a chariot every night, pulled by a horse named Skinfaxi. Skinfaxi's mane lights up the earth and sky.

The d-rune ᛞ is called Daeg "day" in the Anglo-Saxon rune poem. The rune is also part of the Older Futhark, with a reconstructed Proto-Germanic name dagaz. The corresponding letter of the Gothic alphabet 𐌳 d is called dags.