| OAI | Oracle Academic Initiative | 甲骨文学术倡议 |
| OAI | Organizational Activity Interface | 组织活动界面 |
| OAI | Open Archives Initiative (interoperability standards for on-line documents) | 开放档案倡议（在线文档的互操作性标准） |
| OAI | Outside Air Intake | 外部进气口 |
| OAI | Official Action Indicated (US FDA) | 官方行动指示（美国FDA） |
| OAI | Outdoor Advertising Incorporated | 户外广告公司 |
| OAI | Oxford Asymmetry International (pharmaceuticals) | 牛津不对称国际（制药） |
| OAI | Off-Axis Illumination | 离轴照明 |
| OAI | Ohio Aerospace Institute | 俄亥俄航天学院 |
| OAI | Open Archives Initiative | 开放档案倡议 |
| OAI | Open Applications Interface | 开放应用软件接口 |
| OAI | Optical Associates Incorporated | Optical Associates公司 |
| OAI | Ok As Is | 按原样确定 |
| OAI | Optical Associates Inc. | 光学联合公司。 |
| OAI | Outlook Add-In | Outlook加载项 |
| OAI | Optional Additional Insurance (life insurance) | 可选附加保险（人寿保险） |