William Onslow, 4th Earl of Onslow
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For other persons named William Onslow, see William Onslow (disambiguation).
William Hillier Onslow, 4th Earl of Onslow, GCMG, PC (7 March 1853–23 October 1911) was a British Conservative politician.
Having succeeded as 4th Earl of Onslow in 1870, he held office in the governments of Lord Salisbury and Arthur Balfour, including as a Lord in Waiting from 1886 to 1887. From 1889 until 1892 he served as Governor of New Zealand, and from 1905 to 1911 he was Lord Chairman of Committees (Deputy Speaker) of the House of Lords. He was made a Privy Counsellor on his appointment to the Cabinet post of President of the Board of Agriculture in 1903.