The Calvert County Sheriff's Office (CCSO) is the primary law enforcement agency servicing over 87,000 residents and 213 square miles (550 km2) in Calvert County, Maryland.

Given the presence of two major facilities along the shores of the Chesapeake Bay (Calvert Cliffs Nuclear Power Plant and the Cove Point liquified natural gas facility) the sheriff's office has a unique need for maritime law enforcement skills.

In 2008, the Special Operations team took part in the seizing of a cargo ship in the Chesapeake Bay that was involved in a bizarre incident of drunk sailors violating several Coast Guard regulations.

[9] The Sheriff's office has several divisions: Administrative & Judicial Services -Consists of the Civil Process Unit, Courthouse Security Unit, Accreditation, and the Southern Maryland Criminal Justice Academy.

Detention Center -The Detention Center is responsible for detaining pre-trial suspected offenders to adequately assure their appearance at trial or other judicial proceedings and to hold those offenders serving short-term sentences until legally released [10] All CCSO deputies' authority is constitutional in origin and are sworn law enforcement officers with full arrest authority as governed under the Maryland Police and Correctional Training Commission.