California Polytechnic State University, San Luis Obispo (Cal Poly) is a public university in San Luis Obispo County, California, United States, outside of the city limits of San Luis Obispo. Founded in 1901, it is the oldest of three polytechnic universities within the California State University system. Cal Poly emphasizes a "learn by doing" philosophy, integrating hands-on, practical experiences into its curriculum. As of fall 2025, Cal Poly had approximately 22,000 undergraduate and 900 graduate students.

The university is home to several programs, including in engineering, architecture, and business. Most of the university's athletic teams participate in the Big West Conference.