Leikn (Old Norse: in Norse, Old pronounced as /ˈlɛikn/) is a female jötunn in Norse mythology. The 10th-century skald Vetrliði Sumarliðason lists her among the jötnar killed by the thunder god Thor.
The Old Norse name Leikn has been translated as 'trickery'. Stemming from a Proto-Norse form reconstructed as *laikīnō, it is related to the Old Norse leikni ('bewitchment'), and to the Old English scīn-lǣce ('sorceress').
The death of Leikn is mentioned in a lausavísa composed by Vetrliði Sumarliðason which praises Thor for having killed giants and giantesses:
Leggi brauzt Leiknar, lamðir Þrívalda, steypðir Starkeði, stétt of Gjǫlp dauða. | You broke Leikn's bones, you pounded Thrivaldi you cast down Starkad, you stood over the dead Gialp. —Skáldskaparmál (4), Faulkes' translation |
Leikn is also listed in the þulur.