William Arthur Bampfylde Onslow, 6th Earl of Onslow (11 June 1913 – 3 June 1971), known as Viscount Cranley until 1945, was a British peer, politician and army officer.Onslow was the eldest son of Richard William Alan Onslow, 5th Earl of Onslow and the Hon.
Violet Marcia Catherine Warwick Bampfylde, daughter of Coplestone Bampfylde, 3rd Baron Poltimore, and was educated at Winchester College and the Royal Military College, Sandhurst.