Myrddin (disambiguation)
Myrddin is Myrddin Wyllt, a figure in medieval Welsh legend.
Myrddin may also refer to:
- Myrddin (Stargate), a character in the Stargate fictional universe
 - Myrddin Emrys, or Merlin, a legendary figure in Arthurian legend
 - Myrddin Fardd (1836–1921), Welsh writer
 - Myrddin ap Dafydd (born 1956), Welsh writer and publisher