Iduna can mean several things:
- One of several modern anglicizations of the name of the Norse goddess Iðunn.
- A literature society co-founded by Guido von List called Iduna (literature society).
- Asteroid 176 Iduna named after the goddess.
- The Iduna language of Papua New Guinea.
- A genus and subgenus of tree warblers.
- The journal of the Geatish Society.
- Iduna, Wisconsin, an unincorporated community, USA