Urðarbrunnr

thumb|right|200px|The trio of norns at the well Urðarbrunnr as depicted in Fredrik Sander's 1893 translation of the Poetic Edda. Wood engraving by L. B. Hansen.

Urðarbrunnr (Old Norse "Wellspring of Urðr"; either referring to a Germanic concept of fate—urðr—or the norn named Urðr) is a spring or well in Norse mythology. Urðarbrunnr is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. In both sources, the wellspring lies beneath the world tree Yggdrasil, and is associated with a trio of norns (Urðr, Verðandi, and Skuld). In the Prose Edda, Urðarbrunnr is cited as one of three wellsprings existing beneath three roots of Yggdrasil that reach into three distant, different lands; the other two wellsprings being Hvergelmir, located beneath a root in Niflheim, and Mímisbrunnr, located beneath a root near the home of the frost jötnar. Scholarly theory and speculation surrounds the wellspring.