| Abbreviation | Definition |
|---|---|
| NFTW | National Foundation for Teachers Welfare |
| NFWL | National Foundation for Women Legislators |
| NFWU | Noble Foundation Wildlife Unit |
| NGEF | National Guard Educational Foundation |
| NGPF | Narrow Gauge Preservation Foundation |
| NGPF | Nicolaas G Pierson Foundation |
| NGSF | National Genius Search Foundation |
| NGSF | National Go Solar Foundation |
| NHBF | National Hepatitis B Foundation |
| NHF | Natasha Hastings Foundation |
| NHF | National Health Foundation |
| NHF | National Horticulture Foundation |
| NHF | Neurological Health Foundation |
| NHF | Nigerian Healthcare Foundation |
| NHIF | National Home Infusion Foundation |
| NIAF | Naples Italian American Foundation |
| NIBF | Naismith International Basketball Foundation |
| NICF | Namaste India Children's Fund |
| NIEEU | National Institute Electrical Energizing Utilities |
| NIEF | Northern Indiana Education Foundation |