| Acronym | Definition |
|---|
| NDI | National Democratic Institute |
| NDI | National Dance Institute (New York) |
| NDI | Non-Destructive Inspection (such as x-ray of wings for cracks) |
| NDI | Northern Digital, Inc. (Waterloo, Ontario, Canada) |
| NDI | Nephrogenic Diabetes Insipidus |
| NDI | Network Design and Installation |
| NDI | Network Driver Installer |
| NDI | Network Driver Interface |
| NDI | Non Developmental Item |
| NDI | Non-Developmental Item |
| NDI | National Death Index |
| NDI | Neck Disability Index (physical therapy) |
| NDI | New Dietary Ingredient (FDA) |
| NDI | Nissan Design International |
| NDI | Northern Development Initiative (Canada) |
| NDI | National Dialogue Initiative (various organizations) |
| NDI | Nautical Data International |
| NDI | Neurodevelopmental Impairments |
| NDI | Non-Industrial Disability Insurance |
| NDI | Nissay Dowa Insurance (Japan) |
| NDI | No Deception Indicated (polygraph) |
| NDI | National Deliverability Index |
| NDI | Nitrogen Drawdown Index (Australian standard for composts, soil conditioners) |
| NDI | New Data Indicator |
| NDI | Network Deployment and Integration |
| NDI | Numéro de Désignation d'Installation (French) |
| NDI | National Decertification Index (International Association of Directors of Law Enforcement Standards and Training) |
| NDI | Navigation Data Integrator (US Navy) |
| NDI | Nongard Depression Index (self-assessment tool) |
| NDI | Nielsen Drug Index |
| NDI | Normalized Dispersion Index |