In Norse Mythology, Helreginn ("Ruler over Hel"[1]) is a jötunn listed in the þulur section of the Prose Edda book Skáldskaparmál. Other than their name, no additional information about the figure is provided.[2] Rudolf Simek comments that the name is unusual, reasoning that it is unusual for the jötnar to be directly associated with "the underworld."[3]