| Abbreviation | Definition |
|---|---|
| RSEC | Red Sea Environmental Centre |
| RSEI | Risk Screening of Environmental Indicators |
| RSEI | Risk-Screening Environmental Indicators |
| RSFC | River Stream Forecast Component |
| RSOM | Remediation System Operation Monitoring Report |
| RSPC | Radiation Sources Protection Course |
| RSPL | Rajah Sikatuna Protected Landscape |
| RSRS | Responsible Ship Recycling Standard |
| RSRS | Responsible Ship Recycling Standards |
| RSSNP | Russian State Service for Nature Protection |
| RSVP | Regional Smoking Vehicle Program |
| RSVP | Revitalization Shoreline Vegetation Project |
| RTCA | Rivers Trails and Conservation Assistance |
| RTCI | Residual Trap Catch Index |
| RTE | Reclaiming The Everglades |
| RTECS | Registery of Toxic Effects of Chemical Substances |
| RTS | Recycling and |
| RTS | Road Tanker Services |
| RTT | Refrigerant Tracking Tool |
| RUD | Kuh Rud and Eastern Iran Ecoregion |