Ratatoskr may refer to:
- The enemy from Final Fantasy XI.
- The character from Final Fantasy XIV.
- The enemy from Bravely Default.
Ratatoskr is a squirrel who runs up and down the world tree Yggdrasil to carry messages between the eagle Hræsvelgr, perched atop Yggdrasil, and the wyrm Níðhöggr, who dwells beneath one of the three roots of the tree.In Norse mythology,