OMMC
| Acronym | Definition |
|---|---|
| OMMC | Organization of Military Museums of Canada (est. 1992) |
| OMMC | Ontario Mennonite Music Camp (Waterloo, Ontario, Canada) |
| OMMC | Officer Messenger Mail Center (US Navy) |
| OMMC | Operations and Maintenance, Marine Corps (budget line item) |
| OMMC | Ontario Medical Marijuana Cooperative |