Völsung (Old Norse: Vǫlsungr [ˈvɔlsuŋɡr̩], Old English: Wæls) is a figure in Germanic mythology, where he is the eponymous ancestor of the Völsung family (Old Norse: Vǫlsungar, Old English: Wælsings), which includes the hero Sigurð. In Nordic mythology, he is the son of Rerir and was murdered by the Geatish king Siggeir. He was later avenged by one of his sons, Sigmund, and his daughter Signy, who was married to Siggeir.
Völsung's story is recorded in the Völsung Cycle, a series of legends about the clan. The earliest extant versions of the cycle were recorded in medieval Iceland; the tales of the cycle were expanded with local Scandinavian folklore, including that of Helgi Hundingsbane (which appears to originally have been part of the separate tradition of the Ylfings), and form the material of the epic poems in the Elder Edda and of Völsunga saga, which preserves material from lost poems. Völsung is also the subject matter of the Middle High German epic poem Nibelungenlied and is referred to in the Old English epic Beowulf.