| RIO | Rio De Janeiro, Rio De Janeiro, Brazil (Airport Code) | 里约热内卢，里约热内卢，巴西（机场代码） |
| RIO | Research Instruction Online | 在线研究指导 |
| RIO | Remote Inside Option (Compaq) | 远程内部选件（Compaq） |
| RIO | RÉgie des Installations Olympiques | RÉgie des Installations Olympiques |
| RIO | Resolution Independent Object(s) | 分辨率无关对象 |
| RIO | Regional Information Officer (USACE) | 区域信息官（USACE） |
| RIO | Reference Interconnection Offer | 参考互连报价 |
| RIO | Remote Infrastructure Operations | 远程基础设施操作 |
| RIO | RapidIO (Interconnect Architecture) | RapidIO（互连架构） |
| RIO | Realistic Input/Output Opportunity | 现实的输入/输出的机会 |
| RIO | Reusable Information Object | 可重用信息对象 |
| RIO | Random Insanity Online (website) | 随机疯狂在线（网站） |
| RIO | Reintegration of Offenders | 罪犯重返社会 |
| RIO | Rimonabant in Obesity | 利莫那班治疗肥胖症 |
| RIO | Restore Iraqi Oil (US Army mission) | 恢复伊拉克石油（美国陆军任务） |
| RIO | Reverse Implement Option (riding lawnmowers) | 反向机具选项（骑式割草机） |
| RIO | Radar Intercept Officer | 雷达拦截官 |
| RIO | Rock in Opposition (musical genre) | 反对摇滚（音乐流派） |
| RIO | Reverse Implied Odds (Poker) | 反向隐含赔率（扑克） |
| RIO | Ribbonized Organized Integrated (aircraft wiring) | 带状有组织集成（飞机布线） |
| RIO | Random Access Memory Input Output | 随机存取存储器输入输出 |
| RIO | Regional Inspection Officer | 区域检查官 |
| RIO | Reporting In & Out | 研究报告在&出去 |
| RIO | Right, I'm Off | 对,我是 |
| RIO | Resampled Inference of Orthologs | 正交对数的重采样推断 |
| RIO | Remote Input/Output | 遥远的输入/输出 |
| RIO | Rock In Opposition | 反对派中的岩石 |
| RIO | right inferior oblique | 右下斜肌 |
| RIO | rehabilitation institute of ohio | 俄亥俄州康复研究所 |
| RIO | Reviewers International Organization | 评审员国际组织 |
| RIO | Ride It Out | 骑出去 |
| RIO | Resources Input Optimization | 资源投入优化 |
| RIO | Red Iron Oxide | 红色氧化铁 |
| RIO | Rail Incident Officer | 铁路事故官员 |
| RIO | Remote Instant Office | 远程即时办公室 |
| RIO | Riada Internet Objects | Riada Internet对象 |
| RIO | Radx Input Output | Radx输入输出 |
| RIO | Rio De Janeiro International Airport, Rio De Janeiro, Rio de Janeiro, Brazil | 巴西里约热内卢里约热内卢国际机场 |
| RIO | Really Innovative Original | 真正创新的原创 |
| RIO | Remote Input Output | 远程输入输出 |
| RIO | Radio Information Officer | 无线电信息官 |
| RIO | RAM (Random Access Memory) Input/ Output | 随机存取存储器(RAM)输入/输出 |