| Acronym | Definition |
|---|
| NNI➣National Nanotechnology Initiative |
| NNI➣Net National Income (economics) |
| NNI➣Nanaimo (Amtrak station code; Nanaimo, British Columbia, Canada) |
| NNI➣Nortel Networks, Inc. (Ontario, Canada) |
| NNI➣Network-to-Network Interface |
| NNI➣Native Numerical Interface |
| NNI➣Network to Network Interface |
| NNI➣Network to Network Implementation |
| NNI➣Network Node Interface |
| NNI➣No New Information |
| NNI➣Network Node Interface (SS7 SCCP) |
| NNI➣Nederlands Normalisatie-Instituut |
| NNI➣National Neuroscience Institute (Singapore) |
| NNI➣No Net Increase (emission standard; various locations) |
| NNI➣Nikkei Net Interactive (Japan) |
| NNI➣Newport News Industrial |
| NNI➣New Networks Institute |
| NNI➣Norman Noble, Inc. (Cleveland, OH) |
| NNI➣Nearest Neighbour Interchange |
| NNI➣Nehalem New Instructions (computing protocol) |
| NNI➣Network Ninja, Inc. |
| NNI➣Nonnuclear Instrumentation |
| NNI➣Numéro National d'Identité (French: National Identity Number; France) |
| NNI➣Neural Network Interface |
| NNI➣Office of Naval Intelligence Publications (US Navy) |
| NNI➣Non-Sustainable Non-Supportable & Obsolete Items |
| NNI➣Notice of Non-Issue (insurance) |
| NNI➣New Net Investment |