thumb|Aslaug by [[Mårten Eskil Winge (1862)]]
Aslaug ( ), also called Aslög, Kráka (O.N.: ) or Kraba, is a figure in Norse mythology who appears in Snorri's Edda, the Völsunga saga and in the saga of Ragnar Lodbrok as one of his wives.
Aslaug in legend
thumb|upright|King Heimer and Aslaug. Painting by [[August Malmström (1856).]]
According to the 13th-century Tale of Ragnar Lodbrok, Aslaug was the daughter of Sigurd and the shieldmaiden Brynhildr, but was raised by Brynhildr's foster father Heimer. At the deaths of Sigurd and Brynhildr, Heimer was concerned about Aslaug's security, so he made a harp large enough to hide the girl. He then traveled as a poor harp player carrying the harp containing the girl.
thumb|Áke and Grima discover Aslaug. Painting by [[Mårten Eskil Winge (1862).]]
They arrived at Spangereid at Lindesnes in Norway, where they stayed for the night in the house of the peasants Áke and Grima. Áke believed the harp contained valuable items and told his wife Grima. Grima then persuaded him to murder Heimer as he was sleeping. However, when they broke the harp open, they discovered a little girl, whom they raised as their own, calling her Kráka ("Crow"). In order to hide her beauty – the accepted sign of her noble origins It is changed in tone and emphasis by Morris' romanticism, excising the saga's more somber and complicated motifs and portraying Ragnar as the typical hero wooing the maiden.
She appears in Friedrich de la Motte Fouqué's "Aslauga's Knight," published in 1810 with two other Icelandic romances as Der Held des Nordens (The Hero of the North).
A principal character in the television series Vikings (2013–2016), played by Alyssa Sutherland, is loosely based on the legend, and introduced to Ragnar in the manner it described.