| NCSA | Bitmap graphics (Hierarchical Data File) (NCSA) 
| Others |
| NCSA | National Cadet Special Activities
| Others |
| NCSA | National Center for Statistics and Analysis
| Others |
| NCSA | National Center for Supercomputing Applications
| Others |
| NCSA | National Centrer for Supercomputing Applications
| Others |
| NCSA | National Child Search Assistance
| Others |
| NCSA | National Christian School Association
| Others |
| NCSA | National Club Softball Association
| Others |
| NCSA | National Club Swimming Association
| Others |
| NCSA | National Collegiate Scouting Association
| Others |
| NCSA | National Collegiate Sports Archives
| Others |
| NCSA | National Committee of State Associations
| Others |
| NCSA | National Computational Science Alliance
| Others |
| NCSA | National Computer Science Academy
| Others |
| NCSA | National Computer Security Association
| Others |
| NCSA | National Conference on Student Assessment
| Others |
| NCSA | National Customer Service Association
| Others |
| NCSA | National Cyber Security Alliance
| Others |
| NCSA | Nebraska Council of School Administrators
| Others |
| NCSA | NetApp Certified Storage Associate
| Others |
| NCSA | Network Certified Solution Architect
| Others |
| NCSA | Next College Student Athlete
| Others |
| NCSA | Nineteenth Century Studies Association
| Others |
| NCSA | Non Commercial Sustaining Announcement
| Others |
| NCSA | North Carolina School of the Arts
| Others |
| NCSA | North Central Sociological Association
| Others |
| NCSA | North Coast South America
| Others |
| NCSA | North, Central, and South America
| Others |
| NCSA | Northeast Campus Stores Association
| Others |
| NCSA | Northern Counties Soccer Association
| Others |