Ragnar Lodbrok
a legendary Norse ruler and hero from the Viking Age and main character in the 2013 TV series "Vikings"
Ragnar Danneskjold
character in Ayn Rand's "Atlas Shrugged"
In Norse mythology
Ragnarök is a series of future events.
Ragnarok
freeware roguelike video game for DOS
Ragnar the Red
a song from the video game "Skyrim"
Ragnar McRyan
character in video game 'Dragon Quest IV: Chapters of the Chosen'
Ragnar Volarus
character in Pierce Brown's Red Rising trilogy