Jeremy John Heywood, Baron Heywood of Whitehall, (31 December 1961 – 4 November 2018) was a senior British civil servant. He was Cabinet Secretary from 1 January 2012, and Head of the Home Civil Service from September 2014, until stepping down in October 2018. He was the Principal Private Secretary to the Prime Minister, as well as the Downing Street Chief of Staff and the first and only Downing Street Permanent Secretary.