| Term | Full Form | Category |
|---|---|---|
| OMHA | Office of Medicare Hearings and Appeals | Others |
| OMHA | Ohio Manufactured Homes Association | Others |
| OMHA | Okotoks Minor Hockey Association | Others |
| OMHA | Ontario Mental Health Act | Others |
| OMHA | Ontario Minor Hockey Association | Others |
| OMHA | Oregon Manufactured Housing Association | Others |
| OMHA | Oromocto Minor Hockey Association | Others |
| OMHA | Oshawa Minor Hockey Association | Others |