Romuald II the Younger (died 732[1]) was the son of Gisulf I and Winiperga.
He succeeded as duke of Benevento on the death of his father, which is dated variously as 698, 706, or 707.
He took the outlying castle of Cumae from John I of Naples in 716 and ignored Pope Gregory II's pleas and offers of compensation for restitution.
In 717, the pope funded an expedition of John's which decisively defeated his gastald's army and displaced his men from Cuma.
He was succeeded by his son by Gumperga, Gisulf II, but he was a minor and was removed by the usurper Adelais, though his life was spared.