Law enforcement in Los Angeles County is conducted by a variety of law enforcement agencies.

State agencies

• California Highway Patrol
• University of California Police Departments
• California State University Police Department
• California Exposition Park Public Safety
• California State Hospital Police
• California State Park Peace Officer (Ranger)
• California Department of Motor Vehicles Investigations Division.

County agencies

• Los Angeles County Sheriff's Department (10,695 sworn Deputy Sheriffs)
• Los Angeles County Probation Department

City agencies

Alhambra

• Alhambra Police Department

Arcadia

• Arcadia Police Department

Azusa

• Azusa Police Department

Baldwin Park

• Baldwin Park Police Department

Beverly Hills

• Beverly Hills Police Department

Bell

• Bell Police Department

Bell Gardens

• Bell Gardens Police Department

Burbank

• Burbank Police Department

Claremont

• Claremont Police Department

Covina

• Covina Police Department

Culver City

• Culver City Police Department

Downey

• Downey Police Department

El Monte

• El Monte Police Department

El Segundo

• El Segundo Police Department

Gardena

• Gardena Police Department

Glendale

• Glendale Police Department

Glendora

• Glendora Police Department

Hawthorne

• Hawthorne Police Department

Hermosa Beach

• Hermosa Beach Police Department

Huntington Park

• Huntington Park Police Department

Inglewood

• Inglewood Police Department

La Verne

• La Verne Police Department

Los Angeles

• Los Angeles Police Department
• Los Angeles Park Ranger Division
• Los Angeles Airport Police
• Los Angeles Port Police Department
• Los Angeles School Police Department

Long Beach

• Long Beach Police Department
• Long Beach Harbor Patrol

Manhattan Beach

• Manhattan Beach Police Department

Monrovia

• Monrovia Police Department

Montebello

• Montebello Police Department

Monterey Park

• Monterey Park Police Department

Palos Verdes Estates

• Palos Verdes Estates Police Department

Pasadena

• Pasadena Police Department

Pomona

• Pomona Police Department

Redondo Beach

• Redondo Beach Police Department

San Fernando

• San Fernando Police Department

San Gabriel

• San Gabriel Police Department

San Marino

• San Marino Police Department

Santa Fe Springs

• Santa Fe Springs Police Department

Santa Monica

• Santa Monica Police Department

Sierra Madre

• Sierra Madre Police Department

Signal Hill

• Signal Hill Police Department

South Gate

• South Gate Police Department

South Pasadena

• South Pasadena Police Department

Torrance

• Torrance Police Department

Vernon

• Vernon Police Department

West Covina

• West Covina Police Department

Whittier

• Whittier Police Department

Special District agencies

• Los Angeles Society for the Prevention of Cruelty to Animals Los Angeles Law Enforcement Division