| Acronym | Definition |
|---|
| ACO➣Ant Colony Optimization |
| ACO➣Accountable Care Organization (health care) |
| ACO➣Assassin's Creed Odyssey (gaming) |
| ACO➣Automobile Club de l'Ouest (Le Mans racing governing body) |
| ACO➣Australian Chamber Orchestra (Sydney, Australia) |
| ACO➣Animal Control Officer |
| ACO➣Aircraft Certification Office (FAA) |
| ACO➣Administrative Contract(ing) Office(r) |
| ACO➣Administrative Contracting Officer |
| ACO➣A Clockwork Orange (movie/book) |
| ACO➣American Composers Orchestra |
| ACO➣Action Chrétienne en Orient (French: Christian Action in the East) |
| ACO➣Air Cadet Organisation (UK) |
| ACO➣Action Catholique Ouvrière (French: Catholic Workers' Action) |
| ACO➣Assistant Chief Officer (UK Probation Services) |
| ACO➣American College of Orgonomy |
| ACO➣Architectural Conservancy of Ontario (Canada) |
| ACO➣Administrative Consent Order |
| ACO➣Australian College of Optometry (est. 1939) |
| ACO➣Action Object |
| ACO➣Analog Central Office |
| ACO➣Airspace Control Order |
| ACO➣Alpha Chi Omega |
| ACO➣Anglican Communion Office |
| ACO➣Annual Cost of Ownership (finance) |
| ACO➣Access Control Object |
| ACO➣American Cornhole Organization |
| ACO➣Automatic Cut Off |
| ACO➣Air Officer Commanding |
| ACO➣Air Control Order |
| ACO➣AMP Communications Outlet |
| ACO➣Air Control Officer |
| ACO➣Allied Command Operation |
| ACO➣Administrative Compliance Order |
| ACO➣Army Contracting Officer (US Army) |
| ACO➣Atlantic Classical Orchestra (Fort Pierce, FL) |
| ACO➣Animal Control Operations |
| ACO➣Association of Commissioned Officers |
| ACO➣Alarm Cut Off |
| ACO➣Air Coordination Order |
| ACO➣Algorithms, Combinatorics and Optimization (academic program) |
| ACO➣Athlétic Club de l'Ondaine (French athletic club) |
| ACO➣Area Central Office (telecom) |
| ACO➣Actual Contacts for Outlook (Microsoft) |
| ACO➣Authenticated Ciphering Offset |
| ACO➣Access Card Office (US DoD) |
| ACO➣Action Cancer Ontario |
| ACO➣Additional Call Offering |
| ACO➣Assembly and Checkout Officer (US NASA) |
| ACO➣Authorized Contracting Officer |
| ACO➣Airspace Coordination Order |
| ACO➣Arts Computing Office (University of Waterloo) |
| ACO➣Association Canadienne des Optométristes (Canadian Association of Optometrists) |
| ACO➣Association Canadienne des Orthodontistes (Canadian Association of Orthodontists) |
| ACO➣Alternate Contracting Officer (US DoD) |
| ACO➣Austin Civic Orchestra (Austin, TX) |
| ACO➣ATOMAL control officer (NATO) |
| ACO➣Acronym Control Officer |
| ACO➣Association of Canadian Orchestras |
| ACO➣Authorized Certification Official (National Plant Protection Organization) |
| ACO➣Academy of Clinical Oncology (continuing medical education provider) |
| ACO➣Air Combat Order |
| ACO➣Advance Change Order |
| ACO➣Atomic Coordinating Office |
| ACO➣Alvarez Chamber Orchestra (UK) |
| ACO➣Advanced Concepts Office |
| ACO➣Airfield Coordination Officer |
| ACO➣Automated Console Operations |
| ACO➣Army Cryptologic Operations |
| ACO➣Atomic-Cell Orbital |
| ACO➣Associate Contracting Officer |
| ACO➣Average Communication Overhead |
| ACO➣Angolan Community of Ontario (Canada) |
| ACO➣Assistant Contracts Officer |
| ACO➣Assistant Commanding Officer |
| ACO➣Action Cut-Out (switch) |
| ACO➣Area Compliance Officer |