IHRO
| Acronym | Definition |
|---|---|
| IHRO | International Human Rights Observer |
| IHRO | International Human Rights Organization |
| IHRO | International Human Rights Observatory |
| IHRO | International Historic Racing Organization (est. 1985) |
| IHRO | Independent Human Rights Organization |
| IHRO | International Humanitarian Relief Operations |
| IHRO | Intrinsic Heart Rate Observed |