| ICO | International Commission for Optics | 国际光学学会 |
| ICO | International Coffee Organization | 国际咖啡组织 |
| ICO | Sicogon Island, Philippines (Airport Code) | 菲律宾Sicogon岛（机场代码） |
| ICO | International Computer Olympiad | 国际计算机奥林匹克 |
| ICO | Idle Cut-Off (mixture control in piston powered aircraft) | 怠速切断（活塞驱动飞机中的混合气控制） |
| ICO | Incident Command Officer | 事件指挥官 |
| ICO | In-house Computing Option | 内部计算选项 |
| ICO | Institut Catala d'Oncologia (Catalan Institute of Oncology) | Institut Catala d 'Oncologia(加泰罗尼亚癌症) |
| ICO | Initial Calibration Only | 仅初始校准 |
| ICO | Industrial Commission of Ohio | 俄亥俄州工业委员会 |
| ICO | Intellectual Capital Office (PatentCafe) | 智力资本办公室（PatentCafe） |
| ICO | International Cocoa Organization | 国际可可组织 |
| ICO | In Case Of | 万一 |
| ICO | Instituto de CrÉdito Oficial (Spain: Official Credit Institute) | Instituto de CrÉdito Oficial (Spain: Official Credit Institute) |
| ICO | Inner City Outings | 内城出游 |
| ICO | International Catholic Organizations | 国际天主教组织 |
| ICO | Information Commissioner's Office (UK) | 信息专员公署(英国) |
| ICO | Iranian Cultural Organization | 伊朗文化组织 |
| ICO | International Congress of Ophtalmology | 国际眼科学大会 |
| ICO | Integration and Coordination Office | 整合和协调办公室 |
| ICO | Interfaith Community Organization | 宗教间社区组织 |
| ICO | impedance cardiac output | 阻抗心输出量 |
| ICO | international committee for optics | 国际光学委员会 |
| ICO | institute of chemists-opticians | 化学家光学研究所 |
| ICO | International Cooperative Opportunities | 国际合作机会 |
| ICO | Interim Court Order | 临时法院命令 |
| ICO | Integration Coaching | 整合辅导 |
| ICO | International Culture Organization (Kainan University; Taiwan, China) | 国际文化组织（台湾凯南大学） |
| ICO | Intermediate Circular Orbit | 中间圆形轨道 |
| ICO | Instrumentation Control Operator | 仪表控制操作员 |
| ICO | Interface Control Officer | 接口控制官 |
| ICO | International Congress on Obesity | 国际肥胖大会 |
| ICO | International Committee of the PRCA | PRCA国际委员会 |
| ICO | Integrated Contract/Contractor Order | 综合合同/承包商的秩序 |
| ICO | Interagency Committee on Oceanography | 海洋学局际委员会 |
| ICO | International Culture Organization (Kainan University, Taiwan, China) | 国际文化组织（台湾凯南大学） |
| ICO | Installation & Checkout | 安装和结帐 |
| ICO | Icon (File Name Extension) | 图标（文件扩展名） |
| ICO | Initial Cost of Ownership | 初始拥有成本 |
| ICO | Internet Connectivity Option | Internet连接选项 |
| ICO | Item Change Order | 项目变更单 |
| ICO | Illinois Chamber Orchestra | 伊利诺伊室内乐团 |
| ICO | Intensive Corrections Order (Australian criminal justice) | 强化惩戒令（澳大利亚刑事司法） |