| NCAS | National Capital Air Show 
| Others |
| NCAS | National Capital Area Skeptics
| Others |
| NCAS | National Carbon Accounting System
| Others |
| NCAS | National Centre for Antimicrobial Stewardship
| Others |
| NCAS | National Centre for Atmospheric Science
| Others |
| NCAS | National Civic Art Society
| Others |
| NCAS | National Claims Administrative Services
| Others |
| NCAS | National Clinical Assessment Service
| Others |
| NCAS | National Coaching Accreditation Scheme
| Others |
| NCAS | National Coaching And Sport
| Others |
| NCAS | National Compliance Assessment Service
| Others |
| NCAS | National Consortium for Academics and Sports
| Others |
| NCAS | National Consortium for Academics Sports
| Others |
| NCAS | National Core Arts Standards
| Others |
| NCAS | National Cyber Alert System
| Others |
| NCAS | National Cyber Awareness System
| Others |
| NCAS | Nationalcore Artsstandards
| Others |
| NCAS | New Century Air Service
| Others |
| NCAS | Newark College of Arts and Sciences
| Others |
| NCAS | NOAA Center for Atmospheric Sciences
| Others |
| NCAS | Noel Community Arts School
| Others |
| NCAS | North Carolina Academy of Science
| Others |
| NCAS | North Carolina Accounting System
| Others |
| NCAS | North Carolina Amateur Sports
| Others |
| NCAS | North Carolina Archaeological Society
| Others |
| NCAS | Northern Colorado Astronomical Society
| Others |