The San Bernardino County Sheriff-Coroner's Department (SBSD) serves San Bernardino County, California, which is geographically the largest county in the continental United States and is headquartered in San Bernardino. SBSD provides law enforcement services to the unincorporated areas of the county and contract law enforcement services to 14 of the county's cities, including Rancho Cucamonga and Chino Hills, serving a total of 1,029,466 of the county's 2 million residents. The department also operates the county jail system, provides marshal services for the county superior courts, and has other specialized divisions to serve the citizens of San Bernardino County.

San Bernardino County, officially the County of San Bernardino, is a county located in the southern portion of the U.S. state of California, and is located within the Inland Empire area. As of the 2020 U.S. Census, the population was 2,181,654, making it the fifth-most populous county in California and the 14th-most populous in the United States. The county seat is San Bernardino.