Baldr (also Balder, Baldur) is a god in Germanic mythology. In Norse mythology, Baldr is a son of the god Odin and the goddess Frigg, and has numerous brothers, such as Thor and Váli. In wider Germanic mythology, the god was known in Old English as Bældæġ, and in Old High German as Balder, all ultimately stemming from the Proto-Germanic theonym *Balðraz (‘hero’ or ‘prince’).

Apart from this description, Baldr is known primarily for the story of his death, which is seen as the first in a chain of events that will ultimately lead to the destruction of the gods at Ragnarök.