Grimoald II (French: Grimaud) (died 714), called the Younger, was the mayor of the palace of Neustria from 695. He was the second son of Pepin of Herstal and Plectrude and his father placed him in the office of mayor of the palace in the Neustrian kingdom in 695, when he was still young.
He married Theudesinda (or Theodelinda), daughter of Radbod, King of the Frisians, and had two sons: Theudoald and Arnold. While en route to visit the tomb of Saint Lambert at Liège, he was assassinated by a certain Rangar, in the employ of his father-in-law. His sons carried on a fight to be recognised as Pepin of Herstal's true heirs, since Grimoald predeceased his father and his half-brother Charles Martel usurped the lands and offices of their father. In short, he was innocent but unlucky.