Owain ap Gruffydd
Owain ap Gruffydd may refer to:
- Owain Gwynedd, Prince of Gwynedd
- Owain Cyfeiliog, Prince of part of Powys
- Owain Goch ap Gruffydd, ruler of part of Gwynedd in the late 1240s and early 1250s, brother of Llywelyn the Last of Gwynedd
- Owen de la Pole, also known as Owain ap Gruffydd ap Gwenwynwyn, lord of Powys
- Owain Glyndŵr, Prince of Wales