| NDSI | National Defence Security Instructions (Canadian Department of National Defence) | 国防安全指示（加拿大国防部） |
| NDSI | Normalized Difference Snow Index | 归一化差值雪指数 |
| NDSI | Non Direct Surface Installation | 非直接表面安装 |
| NDSI | Network Data Services, Inc. | 网络数据服务公司。 |
| NDSI | Nanoscale Devices and System Integration conference | 纳米器件与系统集成会议 |
| NDSI | NanoDispersion of Silicon | 硅的纳米分散 |