| Acronym | Definition |
|---|
| RTN | Return |
| RTN | Raytheon Company (stock symbol) |
| RTN | Research Training Network |
| RTN | Routing Transit Number |
| RTN | Rotarian |
| RTN | Round Town News (Spain) |
| RTN | Reflective Twisted Nematic |
| RTN | Real-Time Networks (workshop) |
| RTN | Reclaim the Night (Australia) |
| RTN | Rapid Tissue Necrosis |
| RTN | Recursive Transition Network |
| RTN | Real Time News (UNICC) |
| RTN | Register Transfer Notation |
| RTN | Road to Nowhere |
| RTN | Ray Tracing News (Eric Haines newsletter) |
| RTN | Rapid Thermal Nitridation |
| RTN | Racetrack Television Network |
| RTN | Radial Tangential Normal |
| RTN | Resource Task Network |
| RTN | Runner Triathlete News (periodical) |
| RTN | Rock the Nations (rock festival) |
| RTN | Routing Telephone Number |
| RTN | Requirement Tracking Number |
| RTN | Read and Take Notes |
| RTN | Received Track Number |
| RTN | Register Tape Network (Valencia, CA) |
| RTN | Reticular Thalamic Nuclei |
| RTN | Requirements Traceability Network |
| RTN | Relative Threat Number |
| RTN | Restricted Trading Network |
| RTN | Regional Telecommunications Network |
| RTN | Remote Track Number |
| RTN | Renal Tubular Necrosis (kidney disease) |
| RTN | Route to Number |
| RTN | Regional Trade Network (Canada) |
| RTN | Reach the Nations (Christian coalition) |
| RTN | Réseau de Théorie des Nombres (French: Number Theory Network) |