| Acronym | Definition |
|---|
| CCO | Cancer Care Ontario (Canada) |
| CCO | Chief Compliance Officer (corporate title) |
| CCO | Cisco Connection Online (Cisco Systems) |
| CCO | Chief Creative Officer (corporate title) |
| CCO | Chief Customer Officer (corporate title) |
| CCO | Chief Commercial Officer |
| CCO | Chief Communications Officer (corporate title) |
| CCO | Continuous Cardiac Output |
| CCO | Cytochrome C Oxidase |
| CCO | Catholic Christian Outreach (Canada) |
| CCO | College of Chiropractors of Ontario |
| CCO | Centre de Communication de l'Ouest (French: Communication Center of the West) |
| CCO | Close Combat Optic |
| CCO | Chief Clinical Officer (healthcare) |
| CCO | Certified Crane Operator |
| CCO | Contract Change Order |
| CCO | Community Corrections Officer |
| CCO | Conservative Central Office (UK) |
| CCO | Contingency Contracting Officer |
| CCO | Comptoir Change Opéra (French currency exchange office; est. 1955) |
| CCO | Current Controlled Oscillator |
| CCO | Complex Contingency Operations |
| CCO | Condemned: Criminal Origins (video game) |
| CCO | Combat Cargo Officer |
| CCO | Chief Carbon Officer |
| CCO | Canadian Cadet Organizations |
| CCO | Catholic Conference of Ohio (Columbus, Ohio) |
| CCO | Central Control Officer |
| CCO | Communauté de Communes d'Oyonnax (French: Community of Communes of Oyonnax; Oyonnax, France) |
| CCO | Centre de Contrôle des Opérations (French: Operations Control Center; various companies) |
| CCO | COMINT Channels Only |
| CCO | Construction Council of Ontario (Union) |
| CCO | Chief Consulting Officer (corporate title) |
| CCO | Concord Chamber Orchestra (Milwaukee, WI) |
| CCO | Crystal Controlled Oscillator |
| CCO | Charlotte Civic Orchestra (Charlotte, NC) |
| CCO | Chief of Combined Operations |
| CCO | Can't Call Out |
| CCO | Cópia de Carbono Oculta (Portuguese: Blind Carbon Copy) |
| CCO | Customer Care Office |
| CCO | Coastal Caribbean Oils & Minerals, Ltd (former stock symbol; now delisted) |
| CCO | Circuit Control Officer |
| CCO | Container Control Officer |
| CCO | Continuity-Check Outgoing |
| CCO | Circuit Control Office |
| CCO | Computer Center Operator |
| CCO | Canadian College of Organists |
| CCO | Création Concept Optique (French eyeglass designer) |
| CCO | Cercle des Compagnons d'Oniros (French: Oniros Fellowship Circle; gaming community) |
| CCO | Chief Control Officer |
| CCO | Circumpolar Coordination Office (University of the Arctic; Rovaniemi, Finland) |
| CCO | Centre Catalan d'Oncologie (French: Catalan Oncology Center) |
| CCO | Combat Control Officer (Canadian naval equivalent of USN TAO and Royal Navy PWO) |
| CCO | Conception à Coûts Objectifs (French: Design to Cost Objectives; business methodology) |
| CCO | Communications Collection Outstation |
| CCO | Central Contracting Office |
| CCO | Certified Court Officer (Deputy Sheriffs Association of Michigan) |
| CCO | Centre de Conventions d'Oran (French: Oran Convention Center; Oran, Algeria) |
| CCO | Classified Control Officer |
| CCO | Cadet Chief Officer |
| CCO | Compound Cycle Engine |
| CCO | Christian Care Organization |
| CCO | Canberra Community Orchestra (now renamed the National Capital Orchestra) |
| CCO | Critical Compliance Objective |
| CCO | Counterpoint Community Orchestra (Canada) |
| CCO | Clinchfield Railroad Company |
| CCO | Claims Central Office (insurance) |
| CCO | Computing Center Operations |
| CCO | Collapsed Central Office (Tachion Networks, Inc.) |
| CCO | Communications Control Officer |
| CCO | Chief of Combat Operations (US Air Force) |
| CCO | Coal Controller Organization (India) |
| CCO | Clear Channel Outdoor (various locations) |