| RI | Rhode Island | 罗德艾兰 |
| RI | Ring Indicator | 振铃指示 |
| RI | right-insight | 右内中场,位置在中间偏右的中场球员 |
| RI | Refractive Index | 折光指数 |
| RI | Member of the Real Estate Institute of British Columbia | 不列颠哥伦比亚省房地产协会成员 |
| RI | Ranger Instructor (US Army Ranger School) | 游骑兵教官(美国陆军游骑兵学校) |
| RI | Repair and Iterate (part of Generate-and-Repair Machine Translation) | 修复和迭代(生成和修复机器翻译的一部分) |
| RI | Rigorous Imprisonment (police) | 严厉监禁(警察) |
| RI | routing indicator (US DoD) | 路由指示器(美国国防部) |
| RI | Red Ink (band) | 红色墨水(带) |
| RI | Roosevelt Island (New York, NY) | 罗斯福岛(纽约州纽约市) |
| RI | Random Individual | 随机个体 |
| RI | Resistance-Inductance | 电阻电感 |
| RI | Remedial Investigation | 补救调查 |
| RI | Research Interviewer | 研究面试官 |
| RI | Referential Integrity (database rules) | 引用完整性(数据库规则) |
| RI | Randomly Interleaved | 随机交错 |
| RI | Repubblica Italiana (Italian Republic) | 意大利共和国(意大利共和国) |
| RI | RÈglement ImmÉdiat (cash settlement of French shares) | RÈglement ImmÉdiat (cash settlement of French shares) |
| RI | Relações Internacionais (Brazil; International Relations) | Relações Internacionais (Brazil; International Relations) |
| RI | Recombinant Inbred | 重组近交系 |
| RI | Risk-Informed (Nuclear Power) | 风险告知(核电) |
| RI | Raffles Institution (Singapore) | 莱佛士学院(新加坡) |
| RI | Ramblin' Irishman | 爱尔兰人Ramblin ' |
| RI | Rosenbluth International | Rosenbluth国际 |
| RI | Refugees International | 国际难民组织 |
| RI | Rhythmic Initiation (PNF technique) | 节律启动(PNF技术) |
| RI | Relief International | 国际救济组织 |
| RI | Region I | 区域I |
| RI | Respiratory Illness | 呼吸系统疾病 |
| RI | Rise Inside (band) | 内侧隆起(带) |
| RI | Review Item | 评审项目 |
| RI | radioisotope indicator | 放射性同位素指示器 |
| RI | replicative intermediate | 复制中间体 |
| RI | Repulsion Induction | 排斥诱导 |
| RI | reflective index | 反射指数 |
| RI | Rotate In (Hyper Logo Turtle graphics command) | 向内旋转(Hyper Logo Turtle图形命令) |
| RI | radioimmunity | 放射免疫性 |
| RI | regional ileitis | 局部回肠炎 |
| RI | respiratory index | 呼吸指数 |
| RI | right injured | 右侧受伤 |
| RI | recovery index | 回收率指数 |
| RI | remission induction | 缓解诱导 |
| RI | Retention Index | 保留指数 |
| RI | Radiation Intensity | 辐射强度 |
| RI | Residual Income | 剩余收入 |
| RI | Rotary International | 国际扶轮社 |
| RI | Rockwell International | 洛克维尔 |
| RI | Righteous Indignation | 正义的愤怒 |
| RI | Rutherford Institute | 卢瑟福研究所 |
| RI | Reinforced Insulation | 加强绝缘层 |
| RI | Reinsurance | 再保险 |
| RI | Reliability Index | 可靠性指标 |
| RI | Relevant Information | 相关信息 |
| RI | Radio Interference | 无线电干扰 |
| RI | Rijeka, Croatia (license plate) | 克罗地亚里耶卡(车牌) |
| RI | Roslin Institute (UK) | 罗斯林研究所(英国) |
| RI | Reissue | 重新发布 |
| RI | Residual Image | 残余图像 |
| RI | Resonance Integral | 共振积分 |
| RI | Research Instrument | 研究仪器 |
| RI | Resistance Index | 阻力指数 |
| RI | Readership Institute (Northwestern University) | 读者研究所(西北大学) |
| RI | Religious Instruction | 宗教教学 |
| RI | Report of Investigation (NIOSH) | 调查报告(NIOSH) |
| RI | Restricted Issue | 限制性发行 |
| RI | Ring Indicator (for Modem) | 响铃指示器(用于调制解调器) |
| RI | Research Infrastructure | 研究基础设施 |
| RI | Ring It | 给它打电话 |
| RI | Reverse Integration (computer source code merge promotion process) | 反向集成(计算机源代码合并提升过程) |
| RI | Regional Ileitis (pig disease) | 区域性肠炎(猪病) |
| RI | Reconnaissance Inspection | 勘测检查 |
| RI | Routes International | 国际航线 |
| RI | Random Insanity (online comic strip) | 随机疯狂(在线漫画) |
| RI | Record Item | 记录项目 |
| RI | Runway Incursion | 跑道侵入 |
| RI | Rieti, Lazio (Italian province) | 里蒂,拉齐奥(意大利省) |
| RI | Request for Information (usually seen as RFI) | 信息请求(通常称为RFI) |
| RI | Rockefeller Institute | 洛克菲勒研究所 |
| RI | Refractory Index | 耐火指数 |
| RI | Republiek Indonesie (Dutch) | 印度尼西亚共和国(荷兰语) |
| RI | Reporting Identifier | 报告标识符 |
| RI | Rhode Island (US postal abbreviation) | 罗德岛州(美国邮政缩写) |
| RI | Reference Implementation | 参考实施 |
| RI | Republic of Indonesia | 印度尼西亚共和国 |
| RI | Remedial Inspection | 补救检查 |
| RI | Receiving Inspection | 接收检验 |
| RI | Reconnaissance Investigation | 勘测调查 |
| RI | Reactor Incident | 反应堆事故 |
| RI | Registered Importer (US National Highway Traffic Safety Administration) | 注册进口商(美国国家公路交通安全管理局) |
| RI | Routing Identifier | 路由标识符 |
| RI | Retreats International | 国际休养所 |
| RI | Rinnovamento Italiano (Italian Renewal Party) | Rinnovamento Italiano(意大利复兴党) |
| RI | Robotics Institute | 机器人学院 |
| RI | Re-Interview (census) | 重新访谈(人口普查) |
| RI | Right Inboard | 右侧内侧 |
| RI | Reportable Increment | 可报告增量 |
| RI | Random Insanity (gaming community) | 随机疯狂(游戏社区) |
| RI | US Revenue Potato Tax (Scott Catalogue prefix; philately) | 美国税收马铃薯税(斯科特目录前缀;集邮) |