Dúnchad mac Conaing (or Dúnchad mac Dubáin) (died 654) was king of Dál Riata (modern western Scotland). He was joint ruler with Conall Crandomna until he was defeated and killed by Talorcan, king of the Picts, in the battle of Strath Ethairt. Sources differ on Dúnchad's patronym and thus his presumed ancestry. He is presumed to have had at least one son, Conall Cáel (died 681), and it is possible that he was the grandfather, or great-grandfather by some readings, of Fiannamail ua Dúnchado and an ancestor of Dúnchad Bec.