The government of San Bernardino County, California is composed of a five-member Board of Supervisors, each elected from a separate district, and a county executive officer. The Board of Supervisors is the governing body of the county, and is responsible for setting policy, approving the budget, and appointing the county executive officer. The county executive officer is responsible for overseeing the day-to-day operations of the county.

San Bernardino County is the largest county in the state of California, covering an area of 20,105 square miles. It is the fifth most populous county in the United States. The county seat is San Bernardino, and the largest city is Ontario.

The county is home to numerous national parks, forests, and monuments, including the Mojave National Preserve, Joshua Tree National Park, and the San Bernardino National Forest. The county is also home to several military bases, including the Marine Corps Air Ground Combat Center Twentynine Palms and the U.S. Army National Training Center at Fort Irwin.

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