The California State Fair (CSF) is the annual state fair for the state of California. The fair is held at Cal Expo in Sacramento, California. The Fair is a 17-day event showcasing California's industries, agriculture, and diversity of people. The CSF features blue-ribbon animal displays, culinary delights and competitions, live music concerts, a carnival, fireworks, and other family fun. In 2018, officials reported daily attendance drew between 20,000 and 60,000 people per day and about $8.5 million of food and beverage expenditures. The fair is policed by the California Exposition and State Fair Police.

A state fair is an annual competitive and recreational gathering of a U.S. state's population, usually held in late summer or early fall. It is a larger version of a county fair, often including only exhibits or competitors that have won in their categories at the more-local county fairs.