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Onslow was the son of British politician Thomas Cranley Onslow and the grandson of Thomas Onslow, 2nd Earl of Onslow, who played first-class cricket for pre-county club Surrey and the Marylebone Cricket Club.
As Lord Onslow he was a leading participant in an insurance business known as Onslow's Insurance or Onslow's Bubble, which secured incorporation under the Bubble Act as Royal Exchange Assurance Corporation.
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He entered Parliament aged 22 or 23 for an underpopulated rural borough that had once had a market in the medieval period, Gatton, Surrey before moving to represent the larger settlement of Chichester, West Sussex.
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The family seat was Clandon Park, East and West Clandon, Surrey the centrepiece of which, a National Trust mansion and gardens was for the most part commissioned by him.