| Rimini | Airport Code |
| Reactive Majestical Imperial | Business |
| Resource Mining Corporation Ltd | Business |
| Retail Management Institute's | Business |
| Rotonics Manufacturing, Inc. | Business |
| Rocky Mount Instruments | Business |
| Rural Missouri, Incorporated | Business |
| Resource Management Inc | Business Management |
| Retail Management Institute | Business Management |
| Rush Management Inc | Business Management |
| ROX35 Media, Incorporated | Community |
| Real Ministry Immersion | Community |
| Remote Messaging Interface | Computing |
| Resource Manager Interface | Computing |
| Remote Memory Interface | Computing |
| Remote Mode Indicators | Computing |
| Midi Music, Riff Rmid Format | File Type |
| Realty Marts International | General |
| Random Memory Interface | General |
| Responsible Minerals Initiative | General |
| Radio Max Italo | General |
| Radical Mastectomy And Irradiation | General |
| Rocky Mountain Instrument | General |
| Roll Movement Intervention | General |
| Retail Motor Industry | General |
| Repair and Maintenance Information | General |
| Results Measurement Improvement | General |
| Remote Method Invocations | General |
| Remodeling Market Index | General |
| Response Mine Interactive | General |
| Regional Manufacturing Institute | General |
| Residual Metal Impurities | General |
| Remote Method Interaction | General |
| Remote Method Invocationrmi | General |
| Remote Methods Invocation | General |
| Reproductive Medicine Institute | Governmental |
| Rack Manufacturers Institute | Governmental |
| Rocky Mountain Institute's | Governmental |
| Rocky Mountain Institute | Governmental |
| Research Mentoring Institute | Governmental |
| Robert Mondavi Institute | Governmental |
| Radio Magnet Indicator | Governmental |
| Reaction Motors, Inc. | Governmental |
| Railway Miners Institute | Governmental |
| Remote Method Invocation | Information Technology |
| Revista Monumentelor Istorice, Bucureşti | International |
| Revenu Minimum d' Insertion | International |
| Recent Myocardial Infarction | Medical |
| Reperfused Myocardial Infarction | Medical |
| Resource Management Initiative | Medical |
| Risk of Malignancy Index | Medical |
| Rehman Medical Institute | Medical |
| Regional Medical Imaging | Medical |
| Rapid Migraine Initiator | Medical |
| Resources Management Interface | Networking |
| Republic of the Marshall Islands | Regional |
| Railway Mechanics Institute | Regional |
| Radio Magnetic Indicator | Space Science |
