| Abbreviation | Definition |
|---|---|
| NSI | Network Solutions Incorporated |
| NSI | Network Solutions, Inc. |
| NSI | Next Solutions Inc |
| NSI | North Shore Inc |
| NSI | Nuance Systems Inc |
| NSIL | Nalwa Sons Investments Ltd |
| NSIS | Nordevald Software Information Services |
| NSJ | Never Stop JaMMin |
| NSJ | North Star Jet Photo Gallery |
| NSJ | Nybro-Sävsjöströms Järnväg |
| NSKFDC | National Safai Karamcharis Finance and Development Corporation |
| NSKFDC | National Safai Karamcharis Finance Development Corporation |
| NSKFDC | National Safai Karmacharis Finance Development Corporation |
| NSL | Nottingham Scientific Ltd |
| NSM | Nakornthai Strip Mill |
| NSMC | National Student Marketing Corporation |
| NSML | Newcastle Systems Management Ltd |
| NSMPC | Nigeria Security Minting and Printing Company |
| NSMPC | Nippon Steel Metal Products Co. |
| NSN | Nokia Solutions and Networks |