| 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) |