| IHO | Idiopathic Hypertrophic Osteo 
| Others |
| IHO | Ignorance Hypocricy And Obedience
| Others |
| IHO | Ignorance Hypocrisy And Obedience
| Others |
| IHO | Ignorance, Hypocricy, and Obedience
| Others |
| IHO | Ignorance, Hypocrisy, And Obedience
| Others |
| IHO | Im Human Organization
| Others |
| IHO | Impact Health Organization
| Others |
| IHO | Impartial Hearing Officer
| Others |
| IHO | Impeded Harmonic Oscillation
| Others |
| IHO | In His Opinion
| Others |
| IHO | In Home Operations
| Others |
| IHO | In Honor Of
| Others |
| IHO | Inclusionary Housing Ordinance
| Others |
| IHO | Independent Hearing Officer
| Others |
| IHO | Indian Health Organisation
| Others |
| IHO | Industrial Heating Oil
| Others |
| IHO | Industrial Hygiene Officer
| Others |
| IHO | Inferior Human Organs
| Others |
| IHO | Innovative Housing Opportunities
| Others |
| IHO | Institute for Healthcare Optimization
| Others |
| IHO | Institute for Healthcare Optimization's
| Others |
| IHO | Institute of Human Origins
| Others |
| IHO | Integrated Health Outreach
| Others |
| IHO | International Health Olympiad
| Others |
| IHO | International Health Organization
| Others |
| IHO | International History Olympiad
| Others |
| IHO | International Humanitarian Organization
| Others |
| IHO | International Hummer Owners
| Others |
| IHO | International Hydrographic Office
| Others |
| IHO | International Hydrographic Organisation
| Others |
| IHO | International Hydrographic Organization
| Others |
| IHO | Into His Own
| Others |
| IHO | Irvine Housing Opportunities
| Others |