| RSRI | Red Sands Research Institute 
| Others |
| RSRI | Refugee Self Reliance Initiative
| Others |
| RSRI | Regents Scholar Research Initiative
| Others |
| RSRI | Regents Scholars Research Initiative
| Others |
| RSRI | Regroupements Sectoriels de Recherche Industrielle
| Others |
| RSRI | REST Society for Research International
| Others |
| RSRI | Restraint Seclusion Reduction Initiative
| Others |
| RSRI | Retrospective Self Report of Inhibition
| Others |
| RSRI | Reversible Single Radioactive Immunodiffusion
| Others |
| RSRI | Robinson Stafford Rude Inc
| Others |
| RSRI | Routine Site Review Inspection
| Others |
| RSRI | Rudi Schulte Research Institute
| Others |