NCSA may refer to:
National Cadet Special Activities, aviation programs run by the American Civil Air Patrol National Center for Supercomputing Applications, a computer science research center in Urbana, IL NCSA Common log format, a file format for log files produced by web server software NCSA HTTPd, a web server that introduced the Common Gateway Interface NCSA Mosaic, an early web browser instrumental to the popularization of the World Wide Web NCSA Telnet, a software implementation of the Telnet protocol University of Illinois/NCSA Open Source License, a free software license National Center for Supercomputing Applications (Bulgaria), a computer science research center in Sofia, Bulgaria National Child Search Assistance Act, a United States federal law enacted in 1990 National Cyber Security Authority (Israel), a government organization merged into the Israeli National Cyber Directorate NATO Communications and Information Systems Services Agency, a deactivated agency, formerly within NATO Next College Student Athlete, a company facilitating collegiate athletic recruiting North Central Sociological Association, a regional American professional organization
See also University of North Carolina School of the Arts (UNCSA) National Cybersecurity Alliance (NCA)