| OMHA | Ontario Manufactured Housing Association (Canada) | 安大略省人工住房协会（加拿大） |
| OMHA | Ohio Manufactured Homes Association | 俄亥俄州人工住宅协会 |
| OMHA | Oshawa Minor Hockey Association | 奥沙瓦小型曲棍球协会 |
| OMHA | Ontario Minor Hockey Association | 安大略省小型曲棍球协会 |
| OMHA | Oregon Manufactured Housing Association | 俄勒冈州制造住房协会 |
| OMHA | Office of Medicare Hearing & Appeals | 办公室的听力及医疗保险 |