Nathalie Geneviève Marie Kosciusko-Morizet (French pronunciation: ) (born 14 May 1973 in the 15th arrondissement of Paris), often referred to by her initials NKM, is a French politician. She was deputy of the 4th electoral constituency of Essonne from 2002 to 2017, mayor of Longjumeau from 2008 to 2013, and an unsuccessful mayoral candidate for Paris in the local elections in 2014.
She has held the positions of Regional Councillor for Île-de-France; Secretary of State for Ecology; and Minister of Ecology, Sustainable Development, Transport and Housing. She was also Assistant General Secretary of the UMP and spokesperson to Nicolas Sarkozy in the 2012 presidential election. Since standing for the Paris mayoralty in March 2014, she has been leader of the opposition of the Council of Paris. From December 2014 to December 2015 she was Vice President of the UMP (renamed The Republicans).