Martín Lousteau (Occitan pronunciation: ; born December 8, 1970) was the Minister of Economy and Production of Argentina under the administration of President Cristina Fernández de Kirchner, from December 10, 2007, until April 24, 2008. At the age of 37, Lousteau was the youngest person to occupy this office in more than five decades.
Lousteau briefly served as the Argentine Ambassador to the United States from 2015 to 2017. Since 2017, he has been a National Deputy, representing Buenos Aires City.
Lousteau was born in Buenos Aires. He graduated from Colegio Nacional de Buenos Aires. He is a Licentiate in Economics (graduated summa cum laude from the Universidad de San Andrés), and a Master of Science in Economics (at the London School of Economics). He taught as a postgraduate professor at the Universidad Torcuato Di Tella, and as graduate professor at the Universidad de San Andrés.