NCSA
- NATO Communications and Information Systems Services Agency
- NCSA Common log format
- NCSA HTTPd
- NCSA Mosaic
- NCSA Telnet
- National Cadet Special Activities
- National Center for Supercomputing Applications
- National Center for Supercomputing Applications (Bulgaria)
- National Child Search Assistance Act
- National Cyber Security Authority (Israel)
- National Cybersecurity Alliance
- Next College Student Athlete
- North Central Sociological Association
- University of Illinois/NCSA Open Source License
- University of North Carolina School of the Arts