List of law enforcement agencies in Maryland

State agencies

• Maryland Capitol Police
• Maryland Department of Health and Mental Hygiene Police
• Maryland Department of Labor, Licensing, and Regulation Police
• Maryland Department of Natural Resources
• * Maryland Natural Resources Police
• * Maryland Park Service Rangers
• Maryland Motor Vehicle Administration Police Department
• Maryland Office of the Comptroller
• Maryland State Police
• * Maryland State Fire Marshal
• Maryland Transit Administration Police
• Maryland Transportation Authority Police
• Washington Suburban Sanitary Commission Police

  County agencies

• Allegany County Sheriff's Office
• Anne Arundel County Police Department
• Anne Arundel County Sheriff's Office
• Baltimore County Police Department
• Baltimore County Sheriff's Office
• Calvert County Sheriff's Office
• Carroll County Sheriff's Office
• Caroline County Sheriff's Department
• Cecil County Sheriff's Office
• Charles County Sheriff's Office
• Dorchester County Sheriff's Office
• Frederick County Sheriff's Office
• Garrett County Sheriff's Office
• Harford County Sheriff's Office
• Howard County Police Department
• Howard County Sheriff's Office
• Kent County Sheriff's Office
• Montgomery County Police Department
• Montgomery County Sheriff's Office
• Prince George's County Police Department
• Prince George's County Sheriff's Office
• Queen Anne's County Sheriff's Office
• St. Mary's County Sheriff's Office
• Somerset County Sheriff's Office
• Talbot County Sheriff's Office
• Washington County Sheriff's Office
• Wicomico County Sheriff's Office
• Worcester County Sheriff's Office

  Municipal agencies

• Aberdeen Police Department
• Annapolis Police Department
• Baltimore Police Department
• Baltimore City Schools Police
• Baltimore City Sheriff's Office
• Baltimore City Environmental Police
• Bel Air Police Department
• Berlin Police Department
• Berwyn Heights Police Department
• Bladensburg Police Department
• Boonsboro Police Department
• Bowie Police Department
• Brentwood Police Department
• Brunswick Police Department
• Cambridge Police Department
• Capitol Heights Police Department
• Centreville Police Department
• Chestertown Police Department
• Cheverly Police Department
• Chevy Chase Village Police Department
• Colmar Manor Police Department
• Cottage City Police Department
• Crofton Police Department
• Crisfield Police Department
• Cumberland Police Department
• Delmar Police Department
• Denton Police Department
• District Heights Police Department
• Easton Police Department
• Edmonston Police Department
• Elkton Police Department
• Fairmont Heights Police Department
• Federalsburg Police Department
• Forest Heights Police Department
• Frederick City Police Department
• Frostburg City Police Department
• Fruitland Police Department
• Gaithersburg Police Department
• Gibson Island Police
• Glenarden Police Department
• Greenbelt Police Department
• Greensboro Police Department
• Hagerstown Police Department
• Hampstead Police Department
• Hancock Police Department
• Havre De Grace Police Department
• Hurlock Police Department
• Hyattsville City Police Department
• Landover Hills Police Department
• La Plata Police Department
• Laurel Police Department
• Lonaconing Police Department
• Luke Police Department
• Manchester Police Department
• Morningside Police Department
• Mount Airy Police Department
• Mount Rainier Police Department
• New Carrollton Police Department
• North East Police Department
• Oakland Police Department
• Ocean City Police Department
• Ocean Pines Police Department
• Oxford Police Department
• Perryville Police Department
• Pokomoke City Police Department
• Princess Anne Police Department
• Ridgley Police Department
• Rising Sun Police Department
• Riverdale Park Police Department
• Rockville City Police Department
• Rock Hall Police Department
• St. Michaels Police Department
• Salisbury Police Department
• Seat Pleasant Police Department
• Smithsburg Police Department
• Snow Hill Police Department
• Sykesville Police Department
• Takoma Park Police Department
• Taneytown Police Department
• Thurmont Police Department
• Trappe Police Department
• University Park Police Department
• Upper Marlboro Police Department
• Westernport Police Department
• Westminster Police Department

  University agencies

• Anne Arundel Community College, Department of Public Safety & Police
• Baltimore City Community College Department of Public Safety
• Bowie State University, Department of Public Safety
• Breakthrough Bible College Police Office of Law Enforcement & Public Safety
• Carroll Community College Campus Police Department
• Cecil College Public Safety
• Community College of Baltimore County Department of Public Safety
• Coppin State University Police Department
• Frostburg State University Police Department
• Harford Community College Department of Public Safety
• Hood College Department of Campus Safety
• Johns Hopkins University Campus Safety and Security
• Loyola University Maryland Department of Public Safety
• McDaniel College Department of Campus Safety & Campus Police Unit
• Montgomery College Public Safety
• Morgan State University Police Department
• Prince George's Community College Campus Police Department
• Salisbury University Police Department
• St. Mary's College of Maryland Office of Public Safety
• St. Johns College Public Safety
• Towson University Police Department
• United States Naval Academy - Naval Support Activity - Annapolis Police
• University of Baltimore Police Department
• University of Maryland, Baltimore Police Department
• University of Maryland, Baltimore County Police Department
• University of Maryland, College Park Police Department
• University of Maryland, Eastern Shore Department of Public Safety

  Law Enforcement Units within Fire Agencies

• Annapolis Fire Department - Office of the Fire Marshal
• *Bomb Squad
• Anne Arundel County Fire Department - Office of the Fire Marshal
• Montgomery County Fire and Rescue Service - Fire & Explosive Investigations
• *Bomb Squad
• Prince George's County Fire/EMS Department - Office of the Fire Marshal
• *Bomb Squad
• Howard County Department of Fire and Rescue - Office of the Fire Marshal
• City of Hagerstown Fire Department - Office of the Fire Marshal
• Ocean City Fire Marshal Office
• *Bomb Squad

  Other agencies

• Aberdeen Proving Ground Police
• Amtrak Police
• CSX Railroad Police
• Federal Protective Service
• Fort Detrick Police
• Fort Meade Police
• Gibson Island Police
• Maryland-National Capital Park Police
• Metro Transit
• National Institutes of Health Police
• National Institute of Standards and Technology Police
• National Security Agency Police
• Office of the United States Marshal for the District of Maryland
• United States Naval District of Washington Police - Naval Support Activity - Annapolis & US Naval Academy
• United States Park Police
• National Park Service Ranger
• United States Coast Guard Police Department, Baltimore
• United States Department of Veterans Affairs Police
• United States Naval District of Washington Police - Naval Support Activity - Bethesda
• United States Naval District of Washington Police - Naval Support Facility - Indian Head
• United States Naval District of Washington Police - Naval Air Station - Patuxent River
• Naval Criminal Investigative Service
• United States Army Criminal Investigations Division Command

  Defunct agencies

• Housing Authority of Baltimore City Police Force
• Baltimore City Park Police
• Barton Police Department
• Charlestown Police Department
• Clear Spring Police Department
• Emmitsburg Police Department
• Goldsboro Police Department
• Kitzmiller Police Department
• Leonardtown Police Department
• Luke Police Department
• North Beach Police Department
• New Windsor Police Department
• Port Deposit Police Department
• Sparrows Point Police Department
• Union Bridge Police Department
• Williamsport Police Department
• Willards Police Department
• Woodland Beach Police Department
• Allegany County Bureau of Police
• Naval Station Annapolis Police Department
• US Naval Academy Police Department