| OACS | Oakfield Alabama Central School 
| Others |
| OACS | Oakland Avenue Charter School
| Others |
| OACS | Office of Academic and Career Services
| Others |
| OACS | Office of Academic Computing Services
| Others |
| OACS | Office of Active Citizenship and Service
| Others |
| OACS | Office of Alumni and Career Services
| Others |
| OACS | Older Adult Cognitive Screener
| Others |
| OACS | Ontario Alliance of Christian Schools
| Others |
| OACS | Ontario Association of Crime Stoppers
| Others |
| OACS | Opioid Aftercare Coordination Service
| Others |
| OACS | Oracle Analytics Cloud Service
| Others |
| OACS | Oracle Analytics Cloud Services
| Others |
| OACS | Organization for Alternative Careers in Science
| Others |
| OACS | Osceola Adventist Christian School
| Others |
| OACS | Outdoor Adventure and Community Service
| Others |