OMSG
| Acronym | Definition |
|---|---|
| OMSG | Oh My! Sorry, Gas |
| OMSG | Overseas Military Sales Group |
| OMSG | Officine Meccaniche San Giorgio (Italian: Machine Shop San Giorgio) |
| OMSG | Officer Midshipman Study Guide (US Navy) |
| OMSG | Ottawa Medieval Sword Guild (est. 2001; Ottawa, Ontario, Canada) |
| OMSG | Online Media Sales Group (Germany) |
| OMSG | Office of the Massachusetts State Geologist (est. 2002; University of Massachusetts; Amherst, MA) |
| OMSG | Oxford Medical School Gazette (Oxford, England, UK) |
| OMSG | Oh My Stars and Garters |