Saint Louis University (SLU) is a private Roman Catholic four-year research university with campuses in St. Louis, Missouri, United States and Madrid, Spain. Founded in 1818 by Louis Guillaume Valentin Dubourg, It is the oldest university west of the Mississippi River and the second-oldest Jesuit university in the United States. It is one of 28 member institutions of the Association of Jesuit Colleges and Universities.

SLU offers about 100 undergraduate programs and 80 post-baccalaureate programs, along with programs adapted to working adults at both the undergraduate and graduate levels including 25 completely online programs.

The University operates under one overall president but has the following schools with their own deans or directors: College of Arts and Sciences, College of Philosophy and Letters, Doisy College of Health Sciences, School of Medicine, School of Nursing, Center for Advanced Dental Education, Albert Gnaegi Center for Health Care Ethics, College for Public Health & Social Justice, School of Social Work, Richard A. Chaifetz School of Business, School of Education, School of Law, Parks College of Engineering, Aviation and Technology, Campus in Madrid (Spain), School for Professional Studies, Center for Outcomes Research, Center for Sustainability