Thomas Onslow, 2nd Baron Onslow

Thomas Onslow, 2nd Baron Onslow (27 November 1679 – 5 June 1740) was a British politician and landowner who commissioned the building of Clandon Park in the 1730s.

He was born the only surviving son of Richard Onslow, 1st Baron Onslow and became 2nd Baron Onslow on the death of his father in 1717.

He represented a continuous succession of constituencies in the Parliament of England and Great Britain. He first entered Parliament in 1702, aged 22 or 23, as the MP for Gatton, Surrey, an underpopulated rural borough that had once had a market in the medieval period. He was then returned in 1705 to represent the larger settlement of Chichester, West Sussex, followed by Bletchingley (1708–1715) and finally the county seat of Surrey (1715–1717), which then included much of today's Greater London including, for example, Battersea and Lambeth.

He was a Teller of the Receipt of the Exchequer from 1718 to his death.

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.

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.

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