Simon Case CVO (born 27 December 1978) is a British civil servant who is the current Cabinet Secretary and Head of the Home Civil Service since 9 September 2020, succeeding Sir Mark Sedwill. Case was Downing Street Permanent Secretary to Prime Minister Boris Johnson from May to September 2020. That role had been vacant for eight years after Sir Jeremy Heywood left in 2012. From January 2016 to May 2017, Case served under David Cameron and Theresa May as Principal Private Secretary to the Prime Minister of the United Kingdom.