| Abbreviation | Definition |
|---|---|
| NMDP | National Marrow Donor Program |
| NMF | National Marfan Foundation |
| NMFA | National Military Family Association |
| NMHA | National Mental Health Association |
| NMI | Navy Marathon, Inc. |
| NMO | National Member Organization |
| NMRM | National Motorcycle Rider's Memorial |
| NMSC | Nonprofit Management Services of Colorado |
| NMSP | National Marine Sanctuary Program |
| NMSS | National Multiple Sclerosis Society |
| NMSSMI | National Multiple Sclerosis Society of Michigan |
| NMSS-MI | National Multiple Sclerosis Society of Michigan |
| NMSS-NWO | Northwestern Ohio Chapter of the National Multiple Sclerosis Society |
| NMT | NorthWest Medical Teams |
| NMTA | National Minority Trucking Association |
| NMTA | National Money Transmitters Association |
| NMTA | New Mexico Trappers Association |
| NMTI | Northwest Medical Teams International |
| NMTO | Nunavut Municipal Training Organization |
| NMTP | New Milton Town Partnership |