| Acronym | Definition |
|---|
| IEO➣Instituto Español de Oceanografía |
| IEO➣In Excess Of |
| IEO➣Institut d'Estudis Occitans (Catalan: Institute of Occitan Studies) |
| IEO➣Istituto Europeo di Oncologia (Italy) |
| IEO➣Independent Evaluation Office (IMF) |
| IEO➣Interrupt Enable Output |
| IEO➣International Exchange Office |
| IEO➣Information Exploitation Office |
| IEO➣Indian Environmental Office |
| IEO➣Internal Evaluation Office |
| IEO➣Integrated Electronic File |
| IEO➣International Economic Organisation |
| IEO➣Informal Eating Out (restaurant industry) |
| IEO➣In Everyone's Opinion (slang) |
| IEO➣Installation Environmental Office |
| IEO➣Intermediate Earth Orbit |
| IEO➣International English Olympiad (language exam) |