Domhnall Caomhánach (Domhnall mac Murchada or Domhnall Caomhánach mac Murchada, anglicized as Donal Kavanagh) is the ancestor of the Caomhánach line of the Uí Ceinnselaig dynasty and was King of Leinster from 1171 to 1175. Domhnall was the eldest son of the 12th century King of Leinster, Diarmait Mac Murchada in Ireland.