| OMRS | Olympic Model Railroad Society
| Others |
| OMRS | Online Medical Record System
| Others |
| OMRS | Online Meeting Registration System
| Others |
| OMRS | Online Membership and Reporting System
| Others |
| OMRS | Online Membership Reporting System
| Others |
| OMRS | Online Monthly Race Series
| Others |
| OMRS | Online Multiple Report System
| Others |
| OMRS | Ontario Modifieds Racing Series
| Others |
| OMRS | Open Mechanized Reasoning Systems
| Others |
| OMRS | Operations and Maintenance Requirements Specification
| Others |
| OMRS | Orders and Medals Research Society
| Others |