| NECS | National Electronic Clearing Service
| Others |
| NECS | National Electronic Clearing Service (Credit Clearing).
| Others |
| NECS | National Electronic Clearing System
| Others |
| NECS | National Energy Control Services
| Others |
| NECS | New England Cancer Specialists
| Others |
| NECS | New England Catalysis Society
| Others |
| NECS | New England Centenarian Study
| Others |
| NECS | New England Championship Series
| Others |
| NECS | New England Classical Singers
| Others |
| NECS | New England Community Services
| Others |
| NECS | New England Copy Specialists
| Others |
| NECS | New Era Creative Space
| Others |
| NECS | Niger Education and Community Strengthening
| Others |
| NECS | North East Comprehensive School
| Others |
| NECS | North of England Commissioning Support
| Others |