朗纳尔·洛德布罗克（Ragnarr Loðbrók），北欧传说中的半传奇英雄，生活于维京时期。

朗纳尔是一位伟大的海盗领袖，其统治范围可能包括今日的丹麦和瑞典南部。他曾于845年劫掠了巴黎，获得了秃头查理缴纳的大笔赎金。据传说，他最终在865年因为遭遇海难，漂流至英格兰的诺森布里亚国王Aella的领地，被俘后遭处死。

传说中他的妻子是齐格鲁德与女武神布伦希尔德所生的女儿亚丝拉琪。由于朗纳尔之死，他的几个儿子如无骨人伊瓦尔、白衫哈夫丹展开了丹麦入侵，统称为维京雄狮。他的直系后代在瑞典的统治一直到「两个艾历克之战」中，异教徒艾历克落败于其姐夫才宣告结束。

Ragnar Lodbrok or Lothbrok (Old Norse:Ragnarr Loðbrók, "Ragnar Shaggy-Breeches") was a legendary Viking ruler, king, and hero from the Viking Age described in Old Norse poetry and several sagas. In this tradition, Ragnar was the scourge of France and England in the 9th century and the father of many renowned sons, including Ivar the Boneless, Björn Ironside, Halfdan Ragnarsson, Sigurd Snake-in-the-Eye, and Ubba. While these men are historical figures, it is uncertain whether Ragnar himself existed or really fathered them. Many of the tales about him appear to conflate the deeds of several historical Viking heroes and rulers.