ORHA
| Acronym | Definition |
|---|---|
| ORHA | Office of Reconstruction and Humanitarian Assistance (US government; now the Office of the Coalition Provisional Authority) |
| ORHA | Ontario Reining Horse Association (Canada) |
| ORHA | Oregon Rental Housing Association (Salem, OR) |
| ORHA | Oregon Rural Health Association (Salem, OR) |
| ORHA | Ontario Residence Hall Association |
| ORHA | Oxford Regional Health Authority (UK) |