| Acronym | Definition |
|---|
| MNI | Manning (Amtrak station code; Manning, OR) |
| MNI | Manufacturers News Inc (Evanston, IL) |
| MNI | Market News International |
| MNI | Montreal Neurological Institute (Montreal, Quebec, Canada) |
| MNI | Montréal Neurological Institute |
| MNI | Minimum Number of Individuals |
| MNI | Ministry of National Infrastructure (Israel) |
| MNI | Media Networks, Inc. |
| MNI | Master Name Index |
| MNI | Montserrat, Montserrat - Blackburne (Airport Code) |
| MNI | MuggleNet Interactive (Harry Potter fan forum) |
| MNI | Mediation Northern Ireland |
| MNI | Merit Network, Inc. |
| MNI | Mesa Nacional Indígena (Spanish: National Indigenous Board; Costa Rica) |
| MNI | Motorsport News International |
| MNI | Merom New Instruction (computing protocol) |
| MNI | Mobile Network Identity (telecommunications) |
| MNI | Modular Network Interface (computing protocol) |
| MNI | Member of Nautical Institute |