Donnchad Donn

Donnchad Donn
High King of Ireland
Reign919–944
PredecessorNiall Glúndub
SuccessorCongalach Cnogba
King of Mide
Reign919–944
PredecessorConchobar mac Flainn
SuccessorOengus mac Donnchada
Died944
Spouse
Issue
  • Conn
  • Óengus
  • Domnall Donn
  • Flann
  • Óebfhinn
HouseClann Cholmáin
FatherHigh King Flann Sinna
MotherGormlaith ingen Flann mac Conaing

Donnchad Donn mac Flainn (Duncan of the Brown Hair, son of Flann) (died 944) was High King of Ireland and King of Mide. He belonged to Clann Cholmáin, a branch of the southern Uí Néill.