Peter Michael Ainsworth (16 November 1956 – 6 April 2021) was a British Conservative politician who served as Member of Parliament (MP) for East Surrey from 1992 to 2010.

Following his retirement from politics, Ainsworth was appointed UK chair of the Big Lottery Fund and, later, chairman of the Churches Conservation Trust.

[1] On leaving university, he became a researcher to the former Conservative Member of the European Parliament, Sir Jack Stewart-Clark, and then in 1981 became a merchant banker.

Speaking in March 2006, Ainsworth set out the possible new direction for Conservative policy, stating that "Achieving a sustainable world and combating the threat of climate change will require some really fresh ideas and radical thinking.

We cannot expect to meet the challenges of this century by toying with the structures and technologies we have inherited from the past, and the concept of decentralised energy should be taken seriously.

He was also a member of the Campaign to Protect Rural England, Friends of the Earth and the Surrey Wildlife Trust.

Ainsworth was vice-president of the Arthur Bliss Society and a Surrey Campaign to Protect Rural England trustee from 2010 to 2011.

Ainsworth died in the London Borough of Hammersmith and Fulham,[9] of a heart attack,[10] on 6 April 2021, aged 64.