| RAO | Ribeirao Preto, Sao Paulo, Brazil (Airport Code) | Ribeirao Preto，圣保罗，巴西（机场代码） |
| RAO | Run Against Ourselves | 与自己对抗 |
| RAO | Recreational Activities Officer | 康乐活动主任 |
| RAO | Response Amplitude Operator | 响应振幅算子 |
| RAO | Recurrent Airway Obstruction | 复发性气道阻塞 |
| RAO | Right Anterior Oblique (Radiologic Term) | 右前斜肌（放射学术语） |
| RAO | Right Ascension Offset | 右侧上升偏移 |
| RAO | Response Amplitude Operator (mechanical engineering) | 响应振幅操作员（机械工程） |
| RAO | Royal Army of Oman | 阿曼皇家陆军 |
| RAO | Registration Authority Operator | 注册机构操作员 |
| RAO | Regional Accounting Office | 区域会计办公室 |
| RAO | Resident Agent Office | 常驻代理人办公室 |
| RAO | ReadAllOver (image file format) | ReadAllOver（图像文件格式） |
| RAO | Retinal Artery Occlusion | 视网膜动脉阻塞 |
| RAO | Resource Analysis Office | 资源分析办公室 |
| RAO | Regimental Administration Office (BATUS) | 团行政办公室（BATUS） |
| RAO | Regional Aviation Officer (US Forest Service position) | 区域航空官（美国森林局职位） |
| RAO | Residential Actions Office (US military) | 住宅行动办公室（美军） |
| RAO | Remedial Action Objective | 补救行动目标 |
| RAO | Regimental Activities Officer | 团活动干事 |
| RAO | Retiree Activities Office | 退休人员活动办公室 |
| RAO | Revenue Accounting Office | 收入会计办公室 |
| RAO | right anterior oblique | 右前斜位 |
| RAO | Ribeirao Preto, Sao Paulo, Brazil | Ribeirao Preto，圣保罗，巴西 |