| Royal Society of Edinburgh | Academic & Science |
| Rensselaer Society of Engineers | Academic & Science |
| Robotics Society of Engineering | Academic & Science |
| Research Software Engineer | Academic & Science |
| Ramtha’s School of Enlightenment | Academic & Science |
| Rouse Company | Business |
| Reliable System Enterprise | Business |
| Ratio de Solvabilit?Europ?n | Business |
| Reliable System Enterprise Inc. | Business |
| Ratio de Solvabilité Européen | Business |
| Retired Structural Engineer | Business |
| Risk Spend Efficiency | Business |
| Red Storm Entertainment | Business |
| Relationship and Sex Education | Community |
| Removable Storage Elements | Computing |
| Recoverable Service Element | Computing |
| Remote Single Layer Embedded | Computing |
| Remote Streams Environment | Computing |
| Remote Standard Error | Computing |
| Relationships and Sexuality Education | Educational Degree |
| Reactive Sputter Etch | Electronics |
| Referenced Single Ended | Electronics |
| Really Slutty Ethiopian | General |
| Recognised Seasonal Employer | General |
| Rock Springs Elementary | General |
| Richmond So Engineers | General |
| Reverse Screw Element | General |
| Rear Seat Entertainment | General |
| Removable Storage Element | General |
| Registerable Superannuation Entity | General |
| Remote Systems Explorer | General |
| Road Side Equipment | General |
| Regional Special Edition | General |
| Road Safety Education | General |
| Ruby Sapphire and Emerald | General |
| Remote Start Engine | General |
| Retarded Smart Enemies | General |
| Radiator Shutter Enable | General |
| Remote System Explorer | General |
| Remus Sport Exhaust | General |
| Ralf S Engelschall | General |
| Real Street Eliminator | General |
| Randy Schreifels Enterprises | General |
| Rally Sport Engineering | General |
| Regression Standard Error | General |
| Renault Sport Experience | General |
| Reasonable Self Exertion | General |
| Reliant Se | General |
| Runyon Saltzman Einhorn | General |
| Robert Semple Elementary | General |
| Responsabilidad Social Empresarial | General |
| Reduced Sized Exploits | General |
| Robust Standard Error | General |
| Renal Services Exchange | General |
| Registrable Superannuation Entity | General |
| Robots In Service of the Environment | General |
| Ruby Sapphire Emerald | General |
| Remington Special Edition | Governmental |
| Reforma Social Española | International |
| Reforma Social Espa?la | International |
| Rock Search Engine | Internet |
| Resetera | Internet |
| Relative Standard Error | Maths |
| Rosenberg Self Esteem | Medical |
| Risk Score for Asthma Exacerbation | Medical |
| Retrograde Support Element | Military and Defence |
| Rhymesayers Entertainment | News & Entertainment |
| Rose Bay, Sydney, New South Wales, Australia | Regional |
| Red Seal Endorsed | Regional |
| Rhinoplasty Society of Europe | Regional |
| Rhetoric Society of Europe | Regional |
| Race Specific Equipment | Sports |
| Rose Bay Airport | Transport & Travel |
