Sir Bernard Grenville (1567-1636), was an English politician.
He was the eldest surviving son of Richard Grenville (d.1591), lord of the manors of Bideford in Devon and of Stowe in the parish of Kilkhampton, Cornwall and of Buckland Abbey, Devon, whom he succeeded in 1591 when he was lost on the Revenge.
He was appointed High Sheriff of Cornwall for 1596–97, and a Justice of the Peace and a Deputy Lieutenant of Cornwall in 1598. He was a Gentleman of the Privy Chamber to King Charles I in 1628. He was elected a Member of Parliament for Bodmin, Cornwall, in 1597.
He married Elizabeth Bevill, only daughter and heiress of Phillip Bevill of Brinn and Killigarth, by whom he had four sons and a daughter, including: