| Acronym | Definition |
|---|
| ICO | Information Commissioner's Office (UK) |
| ICO | Icon (File Name Extension) |
| ICO | In Case Of |
| ICO | Institut Catala d'Oncologia (Catalan Institute of Oncology) |
| ICO | Inner City Outings |
| ICO | Independent Company |
| ICO | In Care Of |
| ICO | International Catholic Organizations |
| ICO | Industrial Commission of Ohio |
| ICO | Sicogon Island, Philippines (Airport Code) |
| ICO | Idle Cut-Off (mixture control in piston powered aircraft) |
| ICO | Intensive Corrections Order (Australian criminal justice) |
| ICO | Interagency Committee on Oceanography |
| ICO | International Communist Opposition (old anti-communist league) |
| ICO | Ingénierie du Confort et de l'Eau (French energy performance association) |
| ICO | Incident Command Officer |
| ICO | Installation & Checkout |
| ICO | Initial Cost of Ownership |
| ICO | International Congress of Ophtalmology |
| ICO | International Computer Olympiad |
| ICO | Illinois Chamber Orchestra |
| ICO | Integrated Contract/Contractor Order |
| ICO | Instrumentation Control Operator |
| ICO | Integration and Coordination Office |
| ICO | In-house Computing Option |
| ICO | International Culture Organization (Kainan University, Taiwan) |
| ICO | Item Change Order |
| ICO | Integration Coaching |
| ICO | Intracellular Organism |
| ICO | Initial Calibration Only |
| ICO | International Committee of the PRCA |
| ICO | Internet Connected Office |
| ICO | Internet Connectivity Option |
| ICO | International Culture Organization (Kainan University; Taiwan) |
| ICO | Initial Cash Outlay |
| ICO | International Coffee Organization |
| ICO | Intellectual Capital Office (PatentCafe) |
| ICO | International College for Officers (Salvation Army) |
| ICO | Iranian Cultural Organization |
| ICO | International Cooperative Opportunities |
| ICO | Instituto de Crédito Oficial (Spain: Official Credit Institute) |
| ICO | International Commission for Optics |
| ICO | Interface Control Officer |
| ICO | Interfaith Community Organization |
| ICO | Intermediate Circular Orbit |
| ICO | International Cocoa Organization |
| ICO | International Congress on Obesity |
| ICO | Interim Court Order |
| ICO | International Council of Ophthalmology (San Francisco, CA) |