Hagbard was a hero from Scandinavian mythology who remained popular until recent times in the legend of Hagbard and Signy.

He and his brother Haki were legendary sea-kings who appear in several Scandinavian sources, such as the Heimskringla and the Gesta Danorum. See Haki for his battles over the throne of Sweden.

Hagbard fell in love with Signy the daughter of king Sigar, the nephew of king Siggeir (of the Völsunga saga), a love affair which ended tragically in their deaths, when Sigar wanted to have Hagbard executed.

The heroes' connections with other legendary characters place the events in the 4th or the 5th century AD.