Ratchis (also spelled Rachis, Raditschs, Radics, Radiks) was the Duke of Friuli (739–744) and King of the Lombards (744–749). His father was Duke Pemmo. His Roman wife was Tassia. He ruled in peace until he besieged Perugia for reasons unknown. Pope Zachary convinced him to lift the siege, and he abdicated and entered the abbey of Montecassino with his family. After the death of Aistulf in 756, he tried once again to reign over the Lombards, but he was defeated by Desiderius and retired to a cloister.