The name Sigar is worn by two characters in Scandinavian mythology.

The first Sigar is the father of Siggeir, the villainous Geatish king in the Völsunga saga.

The second Sigar is the grand-son of the first Sigar, through his son Sigmund. He had a daughter named Signy. Sigar was in a feud with the sea-king Hagbard, but was informed by Signy's handmaid, that Hagbard had a secret love affair with Signy. Sigar decided to hang Hagbard, who, however, managed to inform Signy of this. Signy set her house on fire and succumbed in the flames while Hagbard executed himself in the gallows. Sigar tried in vain to save both Hagbard and Signy but failed. His only consolation was to bury the treacherous maid alive.