The California State University (Cal State or CSU) is a public university system in California. With 23 campuses and eight off-campus centers enrolling 484,300 students with 26,858 faculty and 25,305 staff, CSU is the largest four-year public university system in the United States. It is one of three public higher education systems in the state, with the other two being the University of California system and the California Community Colleges. The CSU System is incorporated as The Trustees of the California State University. The California State University system headquarters are in Long Beach, California.

The California State University was created in 1960 under the California Master Plan for Higher Education, and it is a direct descendant of the system of California State Normal Schools. With nearly 100,000 graduates annually, the CSU is the country's greatest producer of bachelor's degrees. The university system collectively sustains more than 150,000 jobs within the state, and its related expenditures reach more than $17 billion annually.