NCA may refer to:
Businesses and organisations Australia National Capital Authority, a government authority for development planning of the Capital Territory National Crime Authority, defunct investigative agency
European Union National Competent Authorities, referring to the country-level agencies participating in EU policy frameworks such as European Union competition law or European Banking Supervision
India Nuclear Command Authority (India) National Cricket Academy
Ireland National Consumer Agency, a defunct government body National Cycling Association, a defunct sports governing body
Norway Norwegian Church Aid, a charity Norwegian Coastal Administration, a government agency
Pakistan National College of Arts, Lahore National Command Authority (Pakistan)
United Kingdom National Campaign for the Arts, a lobbying group National Character Area, a type of region in England National Crime Agency, a law enforcement agency The Northern Care Alliance NHS Group, a health-care organisation for Greater Manchester
United States National Climate Assessment, a governmental interagency National Cheerleaders Association, an organization that holds cheer camps and competitions National Credentialing Agency for Laboratory Personnel, a professional association for medical laboratory professionals. National Coffee Association, a coffee industry body National Command Authority (United States), a military doctrine National Communication Association, an organization to promote communication studies as a discipline National Conservation Area, a class of region managed by the Bureau of Land Management North Central Association of Colleges and Schools, one of six organizations that provide higher learning accreditation
Elsewhere National Citizens Alliance, federal political party in Canada National Computerization Agency, a Korean statutory agency for informatization Network of Concerned Anthropologists, an independent ad hoc network of anthropologists seeking to promote an ethical anthropology National Conscription Agency, an agency in Taiwan New Classical Adventure, a record label for classical music based in Hamburg, Germany Nigerian College of Accountancy, training institution in Jos, Nigeria Nippon Cargo Airlines, a cargo airline of Japan Nuevo Central Argentino, an Argentine railway company
Chemistry Amino acid N-carboxyanhydride Lithium nickel cobalt aluminium oxides, a group of lithium-ion battery cathode materials
Computing Network Computing Architecture (disambiguation) Neighbourhood components analysis, a supervised classification technique Nexus Computing Agents, trusted software programs in Microsoft's delayed Next-Generation Secure Computing Base initiative Nortel Certified Architect, the highest Nortel certifications .nca-File ( Nintendo Switch Content Archive- or Nikon Camera Color Adjustment-File)
Law Nature Conservation Act 1992, Queensland, Australia Noise Control Act, a U.S. law more formally known as the Noise Pollution and Abatement Act of 1972 Non-compete agreement, an agreement between an employer and employee prohibiting an employee from working for a competitor after separation
Places New Caledonia, French overseas territory, UNDP country code Nicaragua, by IOC country code Urban community of Nice Côte d'Azur, the intercommunal structure gathering the city of Nice, France and some of its suburbs Ngorongoro Conservation Area, a protected area and World Heritage Site Arusha, Tanzania North Caicos Airport, Turks and Caicos Islands (by IATA code)
Other uses Nationwide Ceasefire Agreement, a landmark ceasefire agreement in Myanmar commonly known by its abbreviation NC.A (born 1996), Korean singer Necessary Condition Analysis, a data analysis method