| ORO | Yoro, Honduras | 洪都拉斯约罗 |
| ORO | oak ridge operation | 橡树岭作业 |
| ORO | oil red o stain | 油红o染色 |
| ORO | oropouche virus(an arbovirus) | 口疮病毒（一种虫媒病毒） |
| ORO | Offsite Response Organization | 场外响应组织 |
| ORO | Oak Ridge Operations, U. S. Department of Energy | 美国能源部橡树岭运营部 |
| ORO | Operations Research Office | 运筹学研究处 |
| ORO | Oak Ridge Operations (DOE) | 橡树岭行动（DOE） |
| ORO | Office of Regional Operations (EPA) | 区域运营办公室（EPA） |
| ORO | Operations Research Organization | 运筹学组织 |