| ROSA | Regional Office for Southern Africa | 南非地区办公室 |
| ROSA | Rickmansworth Old Students Association | 里克曼斯沃思老年学生协会 |
| ROSA | Regional Ozone Study Area (EPA) | 区域臭氧研究区（EPA） |
| ROSA | Receiver Optical Sub Assembly | 接收器光学组件 |
| ROSA | Rig of Safety Assessment | 安全评估钻机 |
| ROSA | Realistic Open Security Architecture | 现实的开放安全体系结构 |
| ROSA | Rotorcraft Open Systems Architecture | 旋翼机开放系统体系结构 |
| ROSA | Regional Office Security Administrator | 区域办公室安全管理员 |
| ROSA | Romanian Space Agency | 罗马尼亚航天局 |
| ROSA | Radar Open Systems Architecture | 雷达开放系统体系结构 |
| ROSA | Regional Office for South Africa (IUCN) | 南非区域办事处（IUCN） |
| ROSA | Report Of Survey Activity | 调查活动报告 |
| ROSA | Report of Supply Activity | 供应活动报告 |
| ROSA | Report of Serious Accident (USACE) | 严重事故报告（USACE） |
| ROSA | Registry of Sidereal Astrologers | Sidereal占星家登记处 |
| ROSA | Rotorcraft Open Systems Avionics | 旋翼机开放系统航空电子设备 |