| NMHS | National Maritime Historical Society
| Others |
| NMHS | National Mental Health Strategy
| Others |
| NMHS | National Meteorological and Hydrological Service
| Others |
| NMHS | National Meteorological and Hydrological Services
| Others |
| NMHS | National Music Honor Society
| Others |
| NMHS | Nebraska Methodist Health Systems
| Others |
| NMHS | New Manchester High School
| Others |
| NMHS | New Milford High School
| Others |
| NMHS | Newark Memorial High School
| Others |
| NMHS | North Marion High School
| Others |
| NMHS | North Mason High School
| Others |
| NMHS | North Mecklenburg High School
| Others |
| NMHS | North Medford High School
| Others |
| NMHS | North Mesquite High School
| Others |
| NMHS | North Metropolitan Health Service
| Others |
| NMHS | North Mississippi Health Services
| Others |
| NMHS | North Montgomery High School
| Others |
| NMHS | North Moore High School
| Others |
| NMHS | North Murray High School
| Others |
| NMHS | Norwood Morialta High School
| Others |