Dagr (Old Norse "day") is a personification of a day in the Norse mythology. He is a son of the dawn god Dellingr and personification of the night Nótt. He is a half-brother of Auðr and Jörð (Earth). His nephew is Thor.
Odin took Dagr and Nótt, gave them each a chariot and a horse—Dagr receiving the horse Skinfaxi—and placed them in the sky to ride around the earth every 24 hours.