In Norse mythology, Járnsaxa (//; Old Norse "iron dagger") is a jötunn. According to Snorri Sturluson's Prose Edda, she was Thor's lover. By him she was the mother of Magni. According to the Poetic Edda poem Hyndluljóð, Járnsaxa is the name of one of the Nine Mothers of Heimdallr.
- Orchard (1997:97).
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