In Norse mythology, Thor is commonly described as the son of Odin and the giantess Jörð, making him a half-god and half-giant figure. While Thor has many divine half-siblings through Odin, this article focuses specifically on a full sister from the same parents within the mythic record. Reliable sources identify one prominent full sister: Þrúðr (Thrud), who shares both father and mother with Thor. Less commonly, some traditions also mention Ullr as a step or regional sibling, though genealogically distinct. The following sections clarify the familial ties, attestations, roles, and modern reception of Thor’s sister, prioritizing the most consistently attested relationships.
