Cadair Berwyn or Cader Berwyn is a mountain summit in north-east Wales with a height of above sea level. It is the highest point in the Berwyn range, and the highest significant summit in Wales outside the National Parks. Cadair Berwyn and Foel Cedig to the west are the two Marilyns that form the Berwyn range. The undulating plateau of the range also includes a large number of other summits above , including satellite summits of Cadair Berwyn and many which are classed as Nuttalls.