Christophe Castaner is a French politician who served as Minister of the Interior from 16 October 2018 to 6 July 2020 under President Emmanuel Macron. He had been elected in 2017 for a three-year term as chairman of the La République En Marche! party with Macron's support. Castaner was Government Spokesperson under Prime Minister Édouard Philippe in 2017 and Secretary of State for Relations with Parliament from 2017 to 2018. He was also Macron's 2017 presidential campaign spokesman.

Minister of the Interior is a prominent position in the Government of France. The position is equivalent to the interior minister in other countries, like the Home Secretary in the United Kingdom, the Minister of Public Safety in Canada, or the Minister of Home Affairs in Australia.