| Solar Reflectance Index | Academic & Science |
| Society for Reproductive Investigation | Academic & Science |
| Spalling Resistance Index | Academic & Science |
| Stanford Research Institute | Academic & Science |
| Sub Rosa Institute | Academic & Science |
| Student Radio Initiative | Academic & Science |
| Student Reporting in Iowa | Academic & Science |
| Summer Research Immersion | Academic & Science |
| Scripps Research Institute | Academic & Science |
| Systems Research Inc | Academic & Science |
| Summer Research Institute | Academic & Science |
| Samarinda | Airport Code |
| Strategic Resources Inc | Business |
| Sustainable Responsible Investment | Business |
| Sumitomo Rubber Industries, Ltd. | Business |
| Sustainable and Responsible Investment | Business |
| Stoneridge, Inc. | Business |
| Specialty Risk International | Business |
| Short Ram Intake | Business |
| Samuels Recycling, Inc. | Business |
| Srei Infr.regs | Business |
| Sipa Resources Ltd | Business |
| Security Resources Inc | Business |
| Socially Responsible Investments | Business |
| Seriously Researched Investments | Business |
| Scholastic Reading Inventory | Community |
| Social Responsibility Initiative | Community |
| School Reform Initiative | Community |
| Service Reminder Indicator | Computer Hardware |
| Signal Rate Indicator | Computing |
| Sip Relay Interface | Computing |
| Supplier Registration Information | Computing |
| System Request Interface | Computing |
| Sending Route Information | Computing |
| System of Root Intensification | General |
| Serotonin Reuptake Inhibitor | General |
| Système de Référence Inertielle | General |
| Solar Reflective Index | General |
| Solar Reflective Index | General |
| System for Rice Intensification | General |
| Sunrise Ridge Intermediate | General |
| Synchrotron Radiation Instrumentation | General |
| Start Running Immediately | General |
| Sport Rated Injection | General |
| Sports Refined Injection | General |
| Smart Roadside Initiative | General |
| Sistema de Retencion Infantil | General |
| System of Rice Intensification | General |
| Seconds Rest Interval | General |
| Sensory Reality Interface | General |
| Sustainable Responsible Impact | General |
| System Requirements Index | General |
| Sustainable Responsible and Impact | General |
| Some Retarded Idiot | General |
| Self Reinvention Innovation | General |
| Steel Recycling Institute | Governmental |
| Solar Roofing Institute | Governmental |
| Siena Research Institute | Governmental |
| Spectrum Research Institute | Governmental |
| Sacrum Romanium Imperium | Governmental |
| Sustainable Recycling Industries | Governmental |
| Stanford Resource Institute | Governmental |
| SALMARI | Indian Railway Station |
| Service des Relations Internationales | International |
| Sponsorship Research International | International |
| Syndicat des Régies Internet | Internet |
| Seratonin Reuptake Inhibitors | Medical |
| Sunnybrook Research Institute | Medical |
| She Really Is | Messaging |
| Standing Request for Information | Military and Defence |
| Surveillance, Reconnaissance, and Intelligence (marine Corps) | Military and Defence |
| Semi Rigid Inflatable | Military and Defence |
| Strategically Relevent Industry | Military and Defence |
| Slope Rising In .... | Physics Related |
| Systegraveme De Reacutefeacuterence Inertielle | Space Science |
| Sports Rated Injection | Sports |
| Slutsky Rotisserie, Inc. | Sports |
| Sport Rally Injection | Sports |
| Socially Responsible Investing | Stock Exchange |
| Singapore Regional Index | Stock Exchange |
| Socially Responsible Investment | Stock Exchange |
