| Acronym | Definition |
|---|
| OAK | One of A Kind |
| OAK | Oakland Raiders (football team) |
| OAK | Osteoarthritis of the Knee |
| OAK | Oem Adaptation Kit |
| OAK | Open Access to Knowledge (Law Project, Australian Commonwealth Department of Education) |
| OAK | Object Application Kernel |
| OAK | Ovarian Awareness of Kentucky |
| OAK | Outstanding Alumnus of Kentucky |
| OAK | Oklahoma-Arkansas-Kansas League (baseball) |
| OAK | Oda e Avokatëve Të Kosovës (Albanian: Kosovo Chamber of Advocates) |
| OAK | Online Army Knife (JEM Software) |
| OAK | Optic Atrophy, Kjer Type |
| OAK | Oakland, CA, USA - Metropolitan Oakland International Apt (Airport Code) |
| OAK | Orange Ant Koala |
| OAK | OEM Adaptation Kit for Windows CE (Microsoft) |