California Science and Engineering Fair
| California Science and Engineering Fair | |
|---|---|
 | |
| Nickname | CSEF |
| Status | Active |
| Genre | Science fair |
| Frequency | Annually |
| Venue | California Lutheran University, Thousand Oaks, California |
| Country | United States |
| Years active | 74 |
| Inaugurated | April 19, 1952 |
| Founder | California Science Teachers' Association |
Previous event | April 13, 2025 |
Next event | April 12, 2026 |
| Participants | 900 |
Activity | Scientific research |
| Organized by | California Science and Engineering Fair Foundation |
| Sponsor | Amgen and Broadcom |
| Website | csef |
The California Science and Engineering Fair (or CSEF), previously known as the California State Science Fair, is a science fair held annually in Los Angeles, California. It serves as the final science fair of the academic year and is a feeder competition to the International Science and Engineering Fair (ISEF) and the Thermo Fisher Junior Innovators Challenge (TFJIC). First established in 1952, CSEF was designated the state's official science fair in 1990 and ran its 74th fair in 2025.
Every year, roughly 900 students from middle schools and high schools across California compete across two divisions and eighteen categories for the chance to win over $30,000 in prizes.