NDSI
| Acronym | Definition |
|---|---|
| NDSI | Normalized Difference Snow Index |
| NDSI | Napier Diversified Services, Inc. (Macon, GA) |
| NDSI | National Defence Security Instructions (Canadian Department of National Defence) |
| NDSI | Network Data Solutions Inc. (San Diego, CA) |
| NDSI | Nicholas Data Services Inc. (Clearwater, FL) |
| NDSI | Near-Drowning Severity Index |