| Acronym | Definition |
|---|
| OMAC | One Key Message Authentication Code |
| OMAC | One-Key CBC Mac |
| OMAC | One Man Army Corps |
| OMAC | Open Modular Architecture Control(ler) |
| OMAC | One Million and Counting (comic book) |
| OMAC | Organization for Machine Automation and Control (Raleigh, NC) |
| OMAC | Once A Month Cooking |
| OMAC | Olney-Margolies Athletic Center (Brown University) |
| OMAC | Observational Metahuman Activity Construct |
| OMAC | Ocala Municipal Arts Commission (Florida) |
| OMAC | Old Man's Aircraft Company (Albany, GA) |
| OMAC | Orlando Modern Art Collection |
| OMAC | Oman Airports Management Company |
| OMAC | Operation Maintenance Administration and Control (Sprint) |
| OMAC | Open Access Managed Choice (healthcare plan) |