ICAO
| Acronym | Definition |
|---|---|
| ICAO | International Civil Aviation Organization |
| ICAO | Institute of Chartered Accountants of Ontario |
| ICAO | Instructions for Continued Airworthiness |
| ICAO | Improvements and Collision Avoidance (conference) |
| ICAO | Industrial Claim Appeals Office (Colorado Department of Labor and Employment) |
| ICAO | Iranian Community Association of Ontario (Canada) |