Ullr (Old Norse: Ullr) is a deity associated with hunting, archery, skiing, and winter, the stepson of Thor and son of Sif. He dwells in his hall Ýdalir (Yew-Dales) as named in Grímnismál, consistent with his role as an archer since yew was the primary bow material. Despite limited mythological narrative in the surviving primary sources, Ullr’s prominence is independently confirmed by unusually rich place-name evidence concentrated in eastern Norway and Sweden — including Ullin, Ullensaker, Ullevi, and Ultuna — suggesting a significantly more prominent position in pre-Christian Scandinavia than the texts reflect.

The Eddic poem Atlakviða (st. 30) mentions an oath sworn on Ullr’s ring — a structural parallel to oaths sworn on Odin’s ring — suggesting that Ullr’s ring held a formal sacred or juridical function. Saxo Grammaticus in Gesta Danorum preserves a tradition in which a figure named Ollerus temporarily rules in Odin’s place during one of Odin’s exiles.

Gylfaginning describes Ullr as an excellent archer and skier, so accomplished in all skills that he should be invoked in single combat.