Saint Louis University (SLU), founded in 1818, is a 200-year-old American university located in St. Louis, Missouri, the oldest Jesuit university in the Mississippi Valley west of the Mississippi River. It is the fourth-largest Jesuit university in the US, with a branch campus in Madrid, Spain.

SLU is known for research in disease, medicine, and environmental issues. The campus hosts several research centers, including the Center for Health Law Studies, the Earthquake Center, the National Center for Aviation Safety Research, and the Center for Sustainability. SLU's notable achievements include the discovery of vitamin K and significant contributions to communication theory. The university offers nearly 100 undergraduate programs, serving over 12,000 students.