| Acronym | Definition |
|---|
| IHO | International Hydrographic Organization |
| IHO | In Honor Of |
| IHO | Impartial Hearing Officer |
| IHO | Institute of Human Origins (Arizona State University) |
| IHO | Imperial Hotel, Osaka (Osaka, Japan) |
| IHO | Intermediate Home Office (various organizations) |
| IHO | Integrated Health Care Organization |
| IHO | Industrieverband Hygiene und Oberflächenschutz Für Industrielle und Institutionelle Anwendung eV (German industrial union of hygiene and surface protection for industrial and institutional application) |
| IHO | Impeded Harmonic Oscillation |
| IHO | Inorganic Halogen Oxidizer |