John Selwyn Gummer, Baron Deben, PC (born 26 November 1939 in , Cheshire) is a British Conservative Party politician, formerly Member of Parliament (MP) for Suffolk Coastal and now a member of the House of Lords.
Lord Deben is Chairman of the UK's independent Committee on Climate Change. He also chairs the sustainability consultancy Sancroft International, recycler Valpak,GLOBE International – the Global Legislators Organisation for a Balanced Environment, the Association of Professional Financial Advisers and Veolia Water UK. He is a non-executive director of Veolia Voda, The Catholic Herald and the Castle Trust – a mortgage and investment firm. He is also a Trustee of the ocean conservation charity, Blue Marine Foundation.
John Gummer stood down from the House of Commons at the 2010 general election and was appointed to the Upper House as Lord Deben.
The eldest son of a Church of England priest, Canon Selwyn Gummer, his younger brother is Peter Gummer, Baron Chadlington, a PR professional.
Gummer attended King's School, Rochester, before going up to Selwyn College, Cambridge where he read History. Whilst there, as chairman of the Cambridge University Conservative Association and later President of the Cambridge Union Society, he was a member of what became known as the Cambridge Mafia – a group of future Conservative Cabinet ministers, including Leon Brittan, Michael Howard, Kenneth Clarke, Norman Lamont, and Norman Fowler.