NCSA

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