| Acronym | Definition |
|---|
| OACS | Ontario Association of Crime Stoppers |
| OACS | Office of Academic Computing Services (University of Maryland) |
| OACS | Outdoor Adventure Club of the South (Atlanta, GA) |
| OACS | Office Action Correspondence Subsystem |
| OACS | Organisation for Anti-Convulsant Syndromes (charity; UK) |
| OACS | Online Advertising Consulting Services (Springfield, VA) |
| OACS | Ohio Association of College Stores (est. 1969) |
| OACS | Oakland-Alameda County Stadium (California) |
| OACS | Outdoor Adventure and Community Service (Humboldt University) |