San Diego University may refer to the following in San Diego, California:
- San Diego University, merged with the San Diego College of Women in 1972 to form the University of San Diego, a private Roman Catholic research university
- San Diego State University, public research university in the California State University system
- University of California, San Diego, public research university in the UC school system
- San Diego University for Integrative Studies, small, private university
- San Diego City College, public, two-year community college