| Abbreviation | Definition |
|---|---|
| NIFC | Northwest Infrastructure Financing Corporation |
| NIG | Nunavut Investment Group |
| NIGC | National Iranian Gas Company |
| NIGP | National Industrial Gas Plant |
| NIGP | Nocton (Tasmania) International Grou, PTY, LTD. |
| NII | Norsat International Inc |
| NIKE | Nike, Inc. (Victory in Greek - Not an acronym) |
| NIMC | National Insurance Marketing Corporation |
| NIOC | National Iranian Oil Company |
| NIOC | National Iron Ore Company |
| NIOPDC | National Iranian Oil Products Distribution Company |
| NIP | Normal Incident Point |
| NIPA | National Investigation & Protection Agency |
| NIPC | National Insurance Professionals Corporation |
| NIPCO | Nigeria Independent Petroleum Company |
| NIPEN | Nigerian Ball-Point Pen Industries |
| NIPI | National Investment Promotions Inc |
| NIPI | National Item Processing Inc |
| NIPI | Nurses In Partnership Inc |
| NIPSCO | Northern Indiana Public Service Company |