 |  |  |
| OA | Office Automation | 办公自动化 |
| OCR | Optical Character Recognition | 光学扫描字符识别 |
| OCT | Octal | 八进制 |
| ODB | Output to Display Buffer | 显示输出缓存 |
| ODBC | Open Database Connectivity | 开放数据库连接 |
| OEM | Original Equipment Manufacture | 初始设备制造商 |
| OH | Off Hook | （调制解调器）摘机 |
| OLCR | Online Character Recognition | 在线手写识别 |
| OLE | Object Linking and Embedding | 对象链接与嵌入 |
| OLTP | Online Transaction Processing | 联机事务处理 |
| ONE | Open Network Environment | 开放网络环境 |
| OPAC | Online Public Access Catalog | 在线公共检索目录 |
| OS | Operating System | 操作系统 |
| OSD | On Screen Display | 屏幕显示（菜单） |
| OSI | Open System Interconnection | 开放系统互连 |
| OSP | Online Service Provider | 在线服务提供商 |
