• Born date: n.a.
  • Born in: n.a.
  • Death year: 0682

Cadwaladr ap Cadwallon (English: Cadwaladr son of Cadwallon, also Cadwallader or Cadwalader) was King of Gwynedd (reigned c. 655 – 682). Two devastating plagues happened during his reign, one in 664 and the other in 682, with himself a victim of the second one. Little else is known of his reign.