Owain ap Gruffydd
Owain ap Gruffydd is the name of the following people:
- Owain ap Gruffydd , actual name of Owain Gwynedd (around 1100–1170), King of Gwynedd
- Owain ap Gruffydd , actual name of Owain Cyfeiliog (around 1130–1197), Prince of Powys Wenwynwyn
- Owain ap Gruffydd († 1236) , Lord of Deheubarth
- Owain ap Gruffydd , actual name of Owain Goch († around 1282), Prince of Gwynedd
- Owain ap Gruffydd (around 1355 – around 1416), Welsh national hero, see Owain Glyndŵr