| Abbreviation | Definition |
|---|---|
| NLB | National Lighting Bureau |
| NLBMDA | National Lumber and Building Materials Dealers Association |
| NLGI | National Lubricating Grease Institute |
| NLGJA | National Lesbian and Gay Journalists Association |
| NLN | National League for Nursing |
| NLNA | National Latina Nurses Association |
| NLNA | National League Of Nursing Association |
| NLNA | North Loop Neighborhood Association |
| NLNA | Northern Liberties Neighbors Association |
| NLNAC | National League for Nursing Accrediting Commission |
| NLOTB | Newfoundland and Labrador Occupational Therapy Board (Canada) |
| NMA | National Management Association |
| NMA | National Meat Association |
| NMA | National Medical Association |
| NMA | National Micrographics Association |
| NMA | Newspaper Marketing Association |
| NMA | Nigerian Medical Association |
| NMAS | New Mexico Academy of Science |
| NMDA | National Motorcycle Dealers Association |
| NMDA | New Mexico Dental Associations |