| ROII | Requisite Organization International Institute | 必要组织国际协会 |
| ROII | Return on Internet Investment | 互联网投资回报 |
| ROII | Return On Inventory Investment | 库存投资回报 |
| ROII | Rock Oil International Incorporated | 洛克石油国际公司 |
| ROII | RAM Optical Instrumentation, Inc. | RAM光学仪器公司。 |
| ROII | Return On Industrial Insurance | 工业保险回报 |
| ROII | Relative Optical Interference Intensity | 相对光学干涉强度 |
| ROII | Reverse Osmosis, second stage | 反渗透，第二阶段 |