Gwydyon (disambiguation)
Gwydyon stands for:
- Gwydyon , wizard from the Celtic mythology of Wales
- Gwydyon (band) , Portuguese folk metal band
Gwydion stands for:
- Gwydion (book series) , children's book series by Peter Schwindt (2006–2008)
Gwyddion stands for:
- Gwyddion , free software for scanning tunneling microscopes
