The Los Angeles County Chief Executive Office (LAC CEO), known as the Los Angeles County Chief Administrative Office (LAC CAO) from 1938 to 2007, manages the day to day operations of Los Angeles County, California and coordinates implementation with the Board of Supervisors.

Critics of this structure complained about the added layer of bureaucracy with the CEO's office and the creation of deputy chief executive officers who were responsible for coordinating activities within their "cluster" (group of related departments) but were not perceived to add any value.

[1] Prior to centralization (similar to a council-manager government prevalent in most of the cities in Los Angeles County) and after reversion to the previous structure, the CEO (CAO prior to 2007) provides Countywide coordination and strategic guidance.

Other tasks specifically given to the CEO include preparation and control of the annual budget in consultation with departments, providing leadership and direction for Board-sponsored initiatives and priorities, analysis and advocacy of state and federal legislation; coordinating Countywide strategic communications and cross-departmental public information (including the main County website), and managing capital projects and debt, asset, leasing and space management.

The CEO's office also administers the risk management and insurance programs, and facilitates departments addressing unincorporated area issues and international protocol issues, manages the county's employee relations program and compensation/classification systems, represents the Board in labor negotiations, and monitors cable television companies operating in unincorporated areas.