William Byron, 4th Baron Byron was an English nobleman, politician, peer, and Gentleman of the Bedchamber to Prince George of Denmark.

Byron was the only surviving son of William Byron, 3rd Baron Byron and Elizabeth Chaworth. He succeeded to the title of 4th Baron Byron in 1695 upon the death of his father.

Lord Byron died at Newstead Abbey on 8 August 1736, and was succeeded by his fourth (but oldest surviving) son William Byron, 5th Baron Byron.