| Acronym | Definition |
|---|
| NCSA | National Center for Supercomputing Applications |
| NCSA | National Collegiate Scouting Association (Chicago, Illinois) |
| NCSA | National Cyber Security Alliance |
| NCSA | National Center for Statistics and Analysis |
| NCSA | North Carolina School of the Arts |
| NCSA | National Computer Security Association |
| NCSA | National Computational Science Alliance |
| NCSA | National Cued Speech Association |
| NCSA | North Central Sociological Association |
| NCSA | Nebraska Council of School Administrators |
| NCSA | National Club Swimming Association |
| NCSA | Non-Commercial Sustaining Announcement |
| NCSA | NATO CIS Services Agency |
| NCSA | Netscreen Certified Security Associate |
| NCSA | North Carolina Society of Anesthesiologists |
| NCSA | Northern California Soaring Association |
| NCSA | North Coast South America (trade route) |
| NCSA | National Cadet Special Activity |
| NCSA | National Crushed Stone Association |
| NCSA | North Carolina Soaring Association (aviation) |
| NCSA | North Carolina Society of Accountants (Conover, North Carolina) |
| NCSA | National Customer Service Association (Normal, IL) |
| NCSA | Nose Creek Swim Association (Calgary, Alberta, Canada) |
| NCSA | Naval C4I Systems Architecture |
| NCSA | Network Current Systems Assessment (Sprint) |
| NCSA | Noncommercial Spot Announcement |
| NCSA | National Computer Science Association (firewall certification) |
| NCSA | Nossa Senhora Conceição Aparecida |
| NCSA | National Coalition of Student Activists (UK) |