| Acronym | Definition |
|---|
| RDN | Relative Distinguished Name (TMN) |
| RDN | Regional District of Nanaimo (Nanaimo, BC, Canada) |
| RDN | Resource Discovery Network |
| RDN | Redirecting Number |
| RDN | Relative Distinguished Name |
| RDN | Resource Discovery Network (UK) |
| RDN | Registered Dental Nurse (UK) |
| RDN | Nsw Rural Doctors Network (NSW, Australia) |
| RDN | Relic Developers Network (video game development) |
| RDN | Religious Diversity News |
| RDN | Redirected Number |
| RDN | Ragazzi Della Nord |
| RDN | Revue Défense Nationale (French: National Defense Review; journal) |
| RDN | Revanche des Nerdz (French Canadian technology TV show) |
| RDN | Routed Data Network |
| RDN | Registered Dietitian and Nutritionist |
| RDN | Routing Domain Number (RFC1069 and BGP) |
| RDN | Ray Density Normalization |
| RDN | Récupération du Nord (French recycling company; est. 1988) |