Merfyn Frych, also known as Merfyn ap Gwriad and Merfyn Camwri, was King of Gwynedd from around 825 to 844, the first of its kings known not to have descended from the male line of King Cunedda.

The Kingdom of Gwynedd was a Welsh kingdom and a Roman Empire successor state that emerged in sub-Roman Britain in the 5th century during the Anglo-Saxon settlement of Britain.