William Byron, 4th Baron Byron (4 January 1669/70 – 8 August 1736) was an English nobleman, politician, peer, and Gentleman of the Bedchamber to Prince George of Denmark.

He succeeded to the title of 4th Baron Byron in 1695 upon the death of his father.

Lord Byron firstly married Lady Mary Egerton, daughter of John Egerton, 3rd Earl of Bridgewater and Lady Jane Powlett, in 1702/3, but they had no children.

His widow Frances remarried Sir Thomas Hay, Bart., of Alderston[3] in 1741 and was buried on 21 September 1757 in Twickenham, Middlesex.

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