Iðavöllr – Splendour Plain. Central expanse of Asgard, where Glaðsheimr and Vingólf are located.
iðn – industriousness. One of the Nine Noble Virtues.
Iðunn – Goddess of the golden apples of Asgard. Wife of Bragi.
illr – bad
illska – cruelty
Ivaldi – Father of the dwarf master smiths who craft Sif’s golden hair, Skíðblaðnir, and Gungnir.
jarl – earl, chieftan
járnleikr – battle
Járnsaxa – Iron Seax. Jötunn lover of Thor. Mother of Magni.
Jörð – jötunn goddess of Earth. Daughter of Nótt and Annar. Mother of Thor and Meili by Óðin. Mother of Frigga by Fjörgynn.
Jörmungandr – Huge Monster. The Midgard Serpent. Son of Loki. Brother of Fenrir and Hel. Fated to kill, and be killed by, Thor at Ragnarök.
Jötnar – the race of giants.
Jötunheimr – realm of the giants. One of the Nine Worlds.
jötunn, jǫtunn – a giant.