| Acronym | Definition |
|---|
| OMIG | Office of Medicaid Inspector General (New York state) |
| OMIG | Ohio Mutual Insurance Group (est. 1901) |
| OMIG | Oral Microbiology and Immunology Group (University of Glasgow; Glasgow, Scotland, UK) |
| OMIG | Old Mutual Investment Group (South Africa; property investing) |
| OMIG | OCTAVE (Operationally Critical Threat, Asset and Vulnerability Evaluation) Method Implementation Guide (information security; Carnegie Mellon University; Pittsburgh, PA) |
| OMIG | OSCE (Organization for Security and Co-operation in Europe) Mission to Georgia (est. 1992; Vienna, Austria) |