| Acronym | Definition |
|---|
| NDA | New Drug Application (US FDA) |
| NDA | Non-Disclosure Agreement |
| NDA | National Democratic Alliance (group of political parties in India) |
| NDA | Notre Dame Academy |
| NDA | National Defence Academy (military training school in India) |
| NDA | National Disability Authority (Ireland) |
| NDA | Nigerian Defence Academy (est. 1964) |
| NDA | Nuclear Decommissioning Authority (UK) |
| NDA | National Defense Academy (Japan) |
| NDA | National Dance Association |
| NDA | Network Data Analyzer |
| NDA | Non Disclosure Agreement |
| NDA | Nevada Department of Agriculture (est. 1915) |
| NDA | National Department of Agriculture (South Africa) |
| NDA | Next Day Air |
| NDA | No Data Available |
| NDA | National Dental Association |
| NDA | Nissan Design America (La Jolla, CA) |
| NDA | Nevada Development Authority |
| NDA | Nuffield Department of Anaesthetics (University of Oxford; UK) |
| NDA | National Dart Association |
| NDA | National Defence Act (Canada) |
| NDA | National Day of Action |
| NDA | National Directory Assistance (Sprint) |
| NDA | Non-Destructive Assay |
| NDA | Nederlandse Dealer Associatie (Dutch) |
| NDA | National Deaf Academy |
| NDA | Non-Data-Aided |
| NDA | Natural Death Act (Washington) |
| NDA | Never Die Alone |
| NDA | New Defence Agenda (Brussels, Belgium) |
| NDA | Non-Destructive Analysis |
| NDA | Nonprescription Drug Advisory (US FDA) |
| NDA | National Drilling Association |
| NDA | Niagara Divers' Association |
| NDA | National Defense Area |
| NDA | Non-Disturbance Agreement |
| NDA | National Defense Act (USA) |
| NDA | Nepal Dental Association (Lalitpur, Nepal) |
| NDA | Not Diagnosed with Anything |
| NDA | Not Deliverable as Addressed (shipping) |
| NDA | National Dance Agency (UK) |
| NDA | Network Data Anonymization |
| NDA | No Detectable Activity |
| NDA | Northern Domestic Airspace |
| NDA | Night Duty Allowance (on overtime forms) |
| NDA | Nebraska Dietetic Association |
| NDA | Nebraska Dressage Association |
| NDA | National Distribution Authority |
| NDA | Natural Disaster Assistance |
| NDA | National Dealers Association |
| NDA | Normal Daily Activity |
| NDA | National Diploma of Agriculture (UK) |
| NDA | New Dimensional Applications (SAP) |
| NDA | Network Design Activity |