| OAK | Oakland, CA, USA - Metropolitan Oakland International Apt (Airport Code) | 美国加利福尼亚州奥克兰-大都会奥克兰国际公寓（机场代码） |
| OAK | Outstanding Alumnus of Kentucky | 肯塔基州杰出校友 |
| OAK | Open Access to Knowledge (Law Project, Australian Commonwealth Department of Education) | 开放获取知识（澳大利亚联邦教育部法律项目） |
| OAK | Ovarian Awareness of Kentucky | 肯塔基州的卵巢意识 |
| OAK | Optic Atrophy, Kjer Type | 视神经萎缩，Kjer型 |
| OAK | Oakland Raiders (football team) | 奥克兰突袭队（足球队） |
| OAK | Object Application Kernel | 对象应用程序内核 |
| OAK | One of A Kind | 独一无二的 |
| OAK | Oakland Raiders | 奥克兰突袭者队 |
| OAK | Metropolitan Oakland International Airport | 奥克兰大都会国际机场 |
| OAK | Orange Ant Koala | 橙色蚂蚁考拉 |
| OAK | Oakland, California USA | 美国加利福尼亚州奥克兰 |
| OAK | Online Army Knife (JEM Software) | 在线军刀（JEM软件） |
| OAK | OEM Adaptation Kit for Windows CE (Microsoft) | 适用于Windows CE（Microsoft）的OEM适配套件 |
| OAK | Oda e Avokatëve Të Kosovës (Albanian: Kosovo Chamber of Advocates) | Oda e Avokatëve Të Kosovës (Albanian: Kosovo Chamber of Advocates) |