| RIS | Review of Information Science | 信息科学综述 |
| RIS | Radar Integration System | 雷达集成系统 |
| RIS | Regional Innovation Strategy (European Commission) | 区域创新战略（欧盟委员会） |
| RIS | Representative Indicator Species (US EPA) | 代表性指示物种（美国环保局） |
| RIS | Regulatory Impact Statement | 监管影响声明 |
| RIS | Reparti Investigazioni Scientifiche (Italy, Carabinieri) | Reparti Investigazioni Scientifiche（意大利，Carabinieri） |
| RIS | Retail Information Systems | 零售信息系统 |
| RIS | Readiness Information System | 战备信息系统 |
| RIS | Redundant Information Sector (COMPAQ) | 冗余信息扇区（COMPAQ） |
| RIS | Raumbezogenes Informationssystem (German: Spacereferred information systems) | Raumbezogenes信息系统（德语：空间参考信息系统） |
| RIS | Rail Interface System (accessory mount on guns) | 导轨接口系统（枪上的附件安装） |
| RIS | Resonance Ionization Spectroscopy | 共振电离光谱学 |
| RIS | River Information Services | 河流信息服务 |
| RIS | Relocation Information Services | 搬迁信息服务 |
| RIS | Radiology Information System | 放射信息系统 |
| RIS | Redwood Inspection Service | 红木检验服务 |
| RIS | Ridgecrest Intermediate School | 里奇克雷斯特中学 |
| RIS | Recreation and Intramural Sports | 娱乐和校内体育 |
| RIS | Reinforced Insulated Sheath (Star Wars armor) | 强化绝缘护套（星球大战装甲） |
| RIS | Restricted Instructional Setting | 受限教学设置 |
| RIS | radioimmunosorbent | 放射免疫吸附 |
| RIS | Research Information System | 研究信息系统 |
| RIS | Radiology Information Systems | 放射信息系统 |
| RIS | Remote Installation Service | 远程安装服务 |
| RIS | Regional Innovation Strategy | 区域创新战略 |
| RIS | Remote Installation Server | 远程安装服务器 |
| RIS | Resistance, Immunity, Susceptibility | 电阻、抗扰度、敏感性 |
| RIS | Reservoir Induced Seismicity | 水库诱发地震 |
| RIS | Reprographic Imaging Services | 复印成像服务 |
| RIS | Ruamrudee International School | Ruamrude国际学校 |
| RIS | Regional Innovation And Strategy | 区域创新与战略 |
| RIS | Radiological Information System | 放射信息系统 |
| RIS | Registration Information Sheet | 注册信息表 |
| RIS | Retail Information System | 零售信息系统 |
| RIS | Republik Indonesia Serikat | 印度尼西亚共和国 |
| RIS | Reliable Internet Systems | 可靠的互联网系统 |
| RIS | Reviving the Islamic Spirit | 复兴伊斯兰精神 |
| RIS | Rishiri, Japan | 日本Rishiri |
| RIS | Regulation Impact Statement | 法规影响声明 |
| RIS | Regional Innovation Strategies | 区域创新战略 |
| RIS | Report/ing Identification Symbol | ing识别标志报告 |
| RIS | Retirement and Insurance Service (a component of OPM) | 退休和保险服务（OPM的一个组成部分） |
| RIS | Research Investment Strategy (Australia) | 研究投资策略（澳大利亚） |
| RIS | Rail Interface System | 轨道接口系统 |
| RIS | Request for Information Services | 信息服务请求 |
| RIS | Reviving the Islamic Spirit (conference) | 复兴伊斯兰精神（会议） |
| RIS | Range Instrumentation System | 靶场仪表系统 |
| RIS | Roosevelt Intermediate School (Westfield, NJ) | 罗斯福中学（新泽西州韦斯特菲尔德） |
| RIS | Random Interleaved Sampling | 随机交错采样 |
| RIS | Romulan Imperial Ship (Star Trek) | 罗慕兰帝国船（星际旅行） |
| RIS | Retirement Income Specialist | 退休收入专家 |
| RIS | Remote Installation Service (Microsoft Windows 2000) | 远程安装服务（Microsoft Windows 2000） |
| RIS | Regulatory Information Service | 监管信息服务 |
| RIS | Robotics Invention System (LEGO) | 机器人发明系统（乐高） |
| RIS | Radio Investigation Service | 无线电调查服务 |
| RIS | Received in Swap | 交换中接收 |
| RIS | Russian Imperial Stout | 帝国世涛 |
| RIS | Retroreflector In Space | 空间反射体 |
| RIS | Rothberg International School (Hebrew University of Jerusalem, Israel) | 罗斯伯格国际学校（以色列耶路撒冷希伯来大学） |
| RIS | Radar Interrogator Set (associated with joint surveillance system) | 雷达询问器组（与联合监视系统相关） |