Mac Cecht

For the warrior(s) of the same name in the Ulster Cycle, see Mac Cécht (warrior)

In Irish mythology, Mac Cecht of the Tuatha Dé Danann was a son of Cermait, son of the Dagda. Mac Cecht's given name was Téthur and he was named Mac Cecht after his god, Cecht, the ploughshare. His wife was Fodla.

He and his brothers Mac Cuill and Mac Gréine killed Lug in revenge for their father. The three brothers became joint High Kings of Ireland, rotating the sovereignty between them a year at a time, covering twenty-nine or thirty years depending on the source consulted. They were the last kings of the Tuatha Dé Danann before the coming of the Milesians.