Roitheachtaigh ("Eochaid's wheels"?) was the name of two legendary High Kings of Ireland.
1. Roitheachtaigh, son of Maen, son of Aengus Olmucada, became king when he overthrew Enna Airgtheach in the 11th or 14th century BC.
2. Roitheachtaigh, son of Roan, became king when he overthrew Sírna. He ruled in the 8th or 11th century BC, introduced chariots pulled by four horses, and died when he was struck by lightning at Dunseverick.
