IChO
| Acronym | Definition |
|---|---|
| IChO | International Chemistry Olympiad |
| IChO | International Curly Horse Organization |
| IChO | International Congress on Hyperthermic Oncology |
| IChO | International Congress on the History of Oceanography |
| IChO | Iran Cultural Heritage Organisation (now Iran Cultural Heritage, Handcrafts and Tourism Organisation) |
| IChO | Improved Cargo Handling Operations (US Army) |