| IRH | Idiopathic reactive hypoglycemia
| Others |
| IRH | Immune Related Hepatitis
| Others |
| IRH | Immune Restoration Handbook
| Others |
| IRH | Indian River High
| Others |
| IRH | Indoor and Radiological Health
| Others |
| IRH | Institute for Reproductive Health
| Others |
| IRH | Institute for Research in the Humanities
| Others |
| IRH | Institute for Restorative Health
| Others |
| IRH | Institute for Rural Health
| Others |
| IRH | Institute of Rural Health
| Others |
| IRH | Intermountain Rigging and HeavyHaul
| Others |
| IRH | Internal Reflecting Horizon
| Others |
| IRH | International Riding Helmets
| Others |
| IRH | Internet Radio Hawaii
| Others |
| IRH | Isolated Recessive Hypomagnesemia
| Others |
| IRH | Issues resolution hearing
| Others |
| IRH | Istanbul Regional Hub
| Others |
| IRH | Itial Restart History
| Others |
| IRH | Riding Helmets
| Others |