Iorwerth mab Owain Gwynedd (or Iorwerth Drwyndwn meaning "the flat-nosed"), (c. 1130–1174), was the eldest legitimate son of Owain Gwynedd (the king of Gwynedd) and his first wife Gwladys (Gladys) ferch Llywarch. He married Marared ferch Madog.
Iorwerth mab Owain Gwynedd (or Iorwerth Drwyndwn meaning "the flat-nosed"), (c. 1130–1174), was the eldest legitimate son of Owain Gwynedd (the king of Gwynedd) and his first wife Gwenllian ferch Llywarch. He married Marared ferch Madog.