| Acronym | Definition |
|---|
| NEI➣Nuclear Energy Institute |
| NEI➣National Eye Institute (NIH) |
| NEI➣Not Enough Items (gaming) |
| NEI➣National Emission Inventory |
| NEI➣Nova Economia Institucional (Portuguese: New Institutional Economics; Brazil) |
| NEI➣Network Entity Identifier |
| NEI➣Network Element Interface |
| NEI➣North Eastern India |
| NEI➣Neuroendocrine-Immune |
| NEI➣Netherlands East Indies |
| NEI➣Not Elsewhere Included |
| NEI➣Nederlands Economisch Instituut (Dutch: Netherlands Economic Institute) |
| NEI➣Neutrophil Elastase Inhibitor |
| NEI➣National Education Institute (Slovenia) |
| NEI➣Not Enough Information |
| NEI➣Network Engineering, Inc. (Indianapolis, IN) |
| NEI➣Nuevos Estados Independientes (Spanish: Newly Independent States) |
| NEI➣New England Independent (est. 2002; wrestling) |
| NEI➣Northwest Earth Institute (Portland, OR) |
| NEI➣National Executive Institute (FBI Academy) |
| NEI➣Nippon Electric Instrument, Inc. (Japan) |
| NEI➣Network Enterprises, Inc. (various locations) |
| NEI➣New Economy Index |
| NEI➣National Elevator Industry |
| NEI➣Noise Equivalent Irradiance |
| NEI➣Nevada Early Intervention |
| NEI➣Nuclear Energy International |
| NEI➣New England Interactive |
| NEI➣Non Explosive Initiator |
| NEI➣Nucleo de Estudantes de Informatica |
| NEI➣National Expertise Index (Canada) |
| NEI➣Núcleo de Estudantes de Informática (Portuguese: Informatics Students Association) |
| NEI➣Network Equipment Identifier |
| NEI➣Nonprofit Education Initiative |
| NEI➣New Equipment Introduction |
| NEI➣New Employee Information |
| NEI➣Network Engines Incorporated |
| NEI➣Network Elements Incorporated |
| NEI➣Network Element Integration |