The Monterey County Sheriff's Office is the county law enforcement agency for Monterey County, California. It provides protection and law enforcement to the non-municipal areas of Monterey County.

The Sheriff's Office provides Monterey County with a special weapons and tactics (SWAT) team, a search and rescue team (SAR), a coroner's division, a court services division, a detention division (jail), a civil services division, a narcotics division, an investigations division, a crime prevention unit, a hostage/crisis negotiation team (HNT), a mounted search unit (volunteer), a K-9 unit, a motor squadron (volunteer), an aero squad (volunteer), and a homeland security division. Each of these is organized into one of three Bureaus: the Administrative Bureau, the Enforcement Operations Bureau, and the Custody Operations Bureau.

The Sheriff's Office was founded in 1850; and as such the department is one hundred and fifty-eight years old. The Sheriff's Office is one of the oldest law enforcement agencies in the state of California. The Sheriff's Office has about 300 employees and a budget of over 50 million dollars.