In-N-Out Burger, usually called In-N-Out, is a chain of fast food restaurants located in the Western United States. Founded in 1948 by Harry Snyder and his wife Esther, and headquartered in Irvine, California, In-N-Out Burger has since expanded outside Southern California to the rest of the state, and to Arizona, Nevada, and southern Utah as well. In-N-Out has never franchised, and plans to remain privately owned. The company's business practices have been noted for employee-centric personnel policies. For example, In-N-Out is one of the few fast food chains in the United States to pay its employees significantly more than state and federally-mandated minimum wage guidelines – starting at $10 per hour in California, as of January 2008.

The In-N-Out restaurant chain has developed a loyal customer base, and has been rated as one of the top fast food restaurants in customer satisfaction in several customer satisfaction surveys. The In-N-Out logo has become an iconic image and symbol of Southern California culture.