| Acronym | Definition |
|---|
| NEC | National Electrical Code |
| NEC | Nippon Electric Company, Ltd. (Japan; now simply NEC) |
| NEC | National Electric Code |
| NEC | National Exhibition Centre |
| NEC | Northeast Conference |
| NEC | Necessary |
| NEC | National Executive Committee (UK Labour Party) |
| NEC | NUS (National University of Singapore) Entrepreneurship Centre |
| NEC | New England College (Henniker, NH) |
| NEC | Not Elsewhere Classified |
| NEC | National Executive Council |
| NEC | National Elections Commission |
| NEC | Northeast Corridor |
| NEC | Necrotizing Enterocolitis |
| NEC | New Europe College (Romania) |
| NEC | Necromancer (Everquest) |
| NEC | Non-Executive Chairman (various companies) |
| NEC | National Economic Council |
| NEC | Network Enterprise Center (US Army) |
| NEC | New Engineering Contract (Institution of Civil Engineers; UK) |
| NEC | Not Even Close (band) |
| NEC | National Energy Commission (various locations) |
| NEC | Northeast Corner (location in an intersection) |
| NEC | National Electoral Council (various locations) |
| NEC | National Examinations Council (Trinidad & Tobago) |
| NEC | Null Energy Condition (physics) |
| NEC | National Essay Competition (various locations) |
| NEC | Nippon Electronics Company |
| NEC | Nueces Electric Cooperative (Robstown, TX) |
| NEC | New England Conservatory of Music (since 1867; in Boston, Massachusetts) |
| NEC | National Enzyme Company (Forsyth, MO) |
| NEC | Network Enabled Capability |
| NEC | National Extension College (UK) |
| NEC | Navy Enlisted Classification |
| NEC | Nanyang Executive Centre (Singapore) |
| NEC | Non-Employee Compensation |
| NEC | National Equestrian Centre (various locations) |
| NEC | Nursing Education Center (various locations) |
| NEC | National Entitlement Card (smartcards; UK) |
| NEC | Net Explosive Content (fireworks) |
| NEC | National Ethics Committee (various organizations) |
| NEC | Nominations and Elections Committee |
| NEC | Niagara Escarpment Commission (Canada) |
| NEC | New Energy Capital (Hanover, NH) |
| NEC | New Embassy Compound |
| NEC | Nursing Education Consortium (various locations) |
| NEC | Nature Education Centre (Australia) |
| NEC | Numerical Electromagnetic Code |
| NEC | Nederlands Elektrotechnisch Comite |
| NEC | Near Eastern Civilizations (various schools) |
| NEC | Nome Eskimo Community (Nome, AK) |
| NEC | Not Even Considered |
| NEC | New Energy Congress |
| NEC | New England Council |
| NEC | Northshore Education Consortium (Beverly, MA) |
| NEC | North Equatorial Current |
| NEC | National Europe Centre |
| NEC | National Episcopal Church |
| NEC | Near East Consulting (Ramallah, Palestine) |
| NEC | Neuroendocrine Convertase |
| NEC | Nu Energy Collective |
| NEC | National Entrepreneur Center (Orlando, FL) |
| NEC | North Eastern Coalfields (India) |
| NEC | National Employment Council (Zimbabwe) |
| NEC | Nuclear Energy Commission |
| NEC | National Empowerment Center, Inc |
| NEC | Nanoelectronics Conference (IEEE) |
| NEC | Necochea, Buenos Aires, Argentina - Necochea (Airport Code) |
| NEC | Non-Elective Contribution (to a qualified retirement plan) |
| NEC | Net Electric Charge |
| NEC | National Ecology Center |
| NEC | National Education Collaborative |
| NEC | Neuro Emotional Complexes |
| NEC | Northern European Command |
| NEC | Northeast Center for Agricultural and Occupational Health |
| NEC | Navopache Electric Cooperative, Inc. |
| NEC | New to Exporting Companies (Canada) |
| NEC | Nuclear Energy Consultants, Inc (Rockville, MD) |
| NEC | Naval Exercise Coordinator |
| NEC | Network Equipment Controller |
| NEC | No End-Item Calibration |
| NEC | Network Event Collector |
| NEC | Nijmeegse Eendrachts Combinatie |
| NEC | Nephrology Channel (website) |
| NEC | Network Enterprise Command |
| NEC | National Environment Campaign |
| NEC | Nascom Event Cancel |