DLTK's Norse Mythology and Viking Legends
Children of Odin
The Children of Odin is a collection of Norse myths suitable for children that are also enjoyable for adults interested in learning more about Viking legends. The collection was written by Padraic Colum in 1920 and I've slightly modified a few of the stories to make them more appropriate for modern children.
The black and white images are drawn by myself and often link to coloring pages if you click on them.
The myths make a bit more sense when you read them from start to finish (rather than picking and choosing them out of order). If you just want a fun myth to read as a "stand alone story", How Thor and Loki Fooled Thrym the Giant is a favorite with kids of all ages (Loki convinces Thor to dress up as a bride, hehe).
The Valkyrie is another interesting Viking legend that can be understood on its own, though it's a more serious story -- it's also an interesting myth because of its small similarities to the fairy tale Sleeping Beauty.
Otherwise, just start reading them in order starting with Far Away and Long Ago and by the end you'll have a pretty good understanding of the characters in Norse mythology.
The Dwellers in Asgard:
How Loki Put the Gods in Danger - Iduna and Her Apples
How Loki Wrought Mischief in Asgard - Sif's Golden Hair
How Brock the Dwarf Brought Judgement on Loki - The Forging of Mjolnir
Heimdall and Little Hnossa - How All Things Came to Be
The All-Father's Forebearings: How Odin Leaves Asgard
Odin the Wanderer:
Odin Goes to Mimir's Well: His Sacrifice for Wisdom
Odin Wins for Men the Magic Mead
Odin Tells to Vidar, His Silent Son, the Secret of His Doings
Thor and Loki in the Giant's City
How Thor and Loki Fooled Thrym the Giant
(How Loki Convinces Thor to Dress Like a Bride)Aegir's Feast: How Thor Triumphed
The Dwarf's Hoard and the Curse that it Brought
The Witch's Heart:
The Sword of the Volsungs and the Twilight of the Gods:
The Sword Gram and the Dragon Fafnir
The Story of Sigmund and Signy
The Story of Sigmund and Sinfiotli
The Vengeance of the Volsungs and the Death of Sinfiotli
Brynhild in the House of Flame
Sigurd at the House of the Nibelungs