| Acronym | Definition |
|---|
| RHN | Regions for Health Network (World Health Organization) |
| RHN | Red Hat Network |
| RHN | Rocking Horse Nursery (UK) |
| RHN | Regional Hub Node (various locations) |
| RHN | Registered Holistic Nutritionist |
| RHN | RedHat Network |
| RHN | The Royal Hospital for Neuro-Disability (London, England) |
| RHN | Russian Hill Neighbors (San Francisco, California) |
| RHN | Revue Historique Neuchâteloise (French) |
| RHN | Rural Housing Network |
| RHN | Robin Norwood |
| RHN | Rockwell Hardness Number |
| RHN | Rh-Null, Regulator Type |
| RHN | Right-Handed Neutrino |
| RHN | Republic of Haven Navy (Honor Harrington science fiction novels) |
| RHN | Remote Health Node (NASA) |
| RHN | Reducing Hex Nipples |
| RHN | Repeater Hybrid Network |
| RHN | Radio Habbo Net |
| RHN | Rougham Hall Nurseries (UK) |