Cathassach mac Máele Cáich (died 682) or Cathassach mac Máele Dúin' was a Dal nAraide king of the Cruthin. He was the son of Máel Cáich mac Scannail (died 666), a previous king.Gearoid Mac Niocaill, Ireland before the Vikings, Gill & MacMillan (1972), pg.138, He ruled from 681-682.
