| ACO | Ant Colony Optimization | 蚁群优化算法 |
| ACO | Alarm Cut-Off | 报警切断 |
| ACO | Alarm Cut-Off | 报警切断 |
| ACO | Architectural Conservancy of Ontario (Canada) | 安大略省建筑保护协会（加拿大） |
| ACO | Association of Commissioned Officers | 委任官员协会 |
| ACO | Association Canadienne des Orthodontistes (Canadian Association of Orthodontists) | 加拿大正畸医师协会 |
| ACO | Answering Common Objections | 回答常见异议 |
| ACO | adaptive control optimization | 自适应控制优化 |
| ACO | Australian Calculator Operation | 澳大利亚计算器操作 |
| ACO | american college of otolaryngologists | 美国耳鼻喉科学会 |
| ACO | american college of organoma | 美国器官瘤学院 |
| ACO | Adobe Color Palette | Adobe调色板 |
| ACO | Artificial Cover Object | 人工覆盖对象 |
| ACO | Australian Chamber Orchestra | 澳大利亚室内乐团 |
| ACO | Alert, cooperative, oriented | 警惕、合作、导向 |
| ACO | AMCOL International Corporation | AMCOL国际公司 |
| ACO | AcciÓn CatÓlica Obrera | AcciÓn CatÓlica Obrera |
| ACO | Automatische Converteerbare Obligatie | 自动转换器 |
| ACO | Acronym Control Officer | 缩写控制官 |
| ACO | American Cornhole Organization | 美国康沃尔组织 |
| ACO | Airfield Coordination Officer | 机场协调官 |
| ACO | Aircraft Certification Office (FAA) | 飞机认证办公室（FAA） |
| ACO | Austin Civic Orchestra (Austin, TX) | 奥斯汀市民乐团（德克萨斯州奥斯汀） |
| ACO | Authenticated Ciphering Offset | 经过身份验证的加密偏移 |
| ACO | Alpha Chi Omega | 阿尔法驰欧米茄 |
| ACO | A Clockwork Orange (movie/book) | 发条橙子电影/书 |
| ACO | Atomic-Cell Orbital | 原子细胞轨道 |
| ACO | Administrative Contract(ing) Office(r) | 行政合同办公室 |
| ACO | Assistant Chief Officer (UK Probation Services) | 助理首席官（英国缓刑服务） |
| ACO | Angolan Community of Ontario (Canada) | 安大略省安哥拉社区（加拿大） |
| ACO | Action Cut-Out (switch) | 动作切断（开关） |
| ACO | Advance Change Order | 提前变更单 |
| ACO | Airspace Coordination Order | 空域协调令 |
| ACO | ATOMAL control officer (NATO) | ATOMAL控制官（北约） |
| ACO | Alternate Contracting Officer (US DoD) | 候补合同官员（美国国防部） |
| ACO | Administrative Contracting Officer | 合同管理官 |
| ACO | alert,cooperative,and oriented | 警惕、合作和定向 |
| ACO | acute coronary occlusion | 急性冠状动脉闭塞 |
| ACO | Air Control Order | 空气控制命令 |
| ACO | Administrative Consent Order | 行政许可令 |
| ACO | Air Coordination Order | 空中协调令 |
| ACO | Air Cadet Organisation (UK) | 航空学员组织（英国） |
| ACO | Area Central Office (telecom) | 区域中心办公室（电信） |
| ACO | Airspace Control Order | 空域管制令 |
| ACO | Army Cryptologic Operations | 陆军密码作战 |
| ACO | Automobile Club de l'Ouest (Le Mans racing governing body) | 汽车俱乐部de fixation 'Ouest(勒芒赛车管理机构) |
| ACO | Access Card Office (DOD) | 门禁卡办公室（DOD） |
| ACO | Alarm Cut Off | 报警切断 |
| ACO | Air Control Officer | 飞机引导军官 |
| ACO | Advanced Concepts Office | 高级概念办公室 |
| ACO | Automated Console Operations | 自动化控制台操作 |
| ACO | Allied Command Operation | 盟军司令部作战 |
| ACO | Australian Chamber Orchestra (Sydney, Australia) | 澳大利亚室内乐团（澳大利亚悉尼） |
| ACO | AMP Communications Outlet | AMP通信插座 |
| ACO | Animal Control Operations | 动物控制操作 |
| ACO | Access Control Object | 访问控制对象 |
| ACO | Atomic Coordinating Office | 原子协调办公室 |
| ACO | Area Compliance Officer | 区域合规官 |
| ACO | Assistant Contracts Officer | 助理合同官 |
| ACO | Administrative Compliance Order | 行政合规令 |
| ACO | Academy of Clinical Oncology (continuing medical education provider) | 临床肿瘤学学院（继续医学教育提供者） |
| ACO | Action Cancer Ontario | 安大略省癌症行动 |
| ACO | Associate Contracting Officer | 副合同官员 |
| ACO | American College of Orgonomy | 美国生殖学院 |
| ACO | Animal Control Officer | 动物控制官员 |
| ACO | Additional Call Offering | 其他通话服务 |
| ACO | Arts Computing Office (University of Waterloo) | 艺术计算办公室（滑铁卢大学） |
| ACO | Automatic Cut Off | 自动切断 |
| ACO | Authorized Contracting Officer | 授权签订合同官 |
| ACO | Air Combat Order | 空战命令 |
| ACO | Average Communication Overhead | 平均通信开销 |
| ACO | Association Canadienne des OptomÉtristes (Canadian Association of Optometrists) | Association Canadienne des OptomÉtristes (Canadian Association of Optometrists) |