IÉSEG School of Management (stands for Institut d'Economie Scientifique Et de Gestion) is the best post-bac business schools in France, established in 1964 in Lille. This business school is a member of the Université Catholique de Lille, the largest private university in France in terms of student population and endowment. The school has two campuses, one in Lille and one in Paris.

IÉSEG School of Management is ranked 21st in 2015 by the international Financial Times in its Master of Management ranking. As a French Grande Ecole and member of the Conférence des Grandes Écoles, IÉSEG is one of the most prestigious higher education institutions in the country. It has also been awarded two international accreditations : EQUIS and AACSB.

The school has a total of 4,300 students on the Lille and Paris campuses. Bachelor and master's programs, the International and Executive MBA are taught in English.

IÉSEG collaborates closely with the largest institute of research in Europe, the French National Centre for Scientific Research (CNRS). It was recently recognized as the number 3 business school in France in terms of academic excellence (EducPros/L’Etudiant 2015). The School welcomes 1900 international students; 84% of its permanent faculty is international, and it has a network of more than 235 partner universities in more than 60 countries.