| National Bureau of Investigation | National Bureau of Plant Genetic Resources | National Bureau of Professional Management Consultants | National Bureau of Soil Survey and Land Use Planning | National Bureau of Standards |
| (National) Bureau of Standards | National Bureau of Standards Information Report | National Bureau of Standards Reactor | National Bureau of Standards Special Publication | National Bureau of Statistics |
| National Bureau of Statistics of China | National Burglar and Fire Alarm Association | National Burn Awareness Week | National Burn Bed Bureau | National Burn Repository |
| National Burns Collection | National Burn Victim Foundation | National Bursary Scheme | National Bus and Railworkers Union | National Business Agent |
| National Business and Economics Society | National Business and Law Association | National Business and Professional Association | National Business and Technical Examinations Board | National Business Angels Network |
| National Business Association | National Business Coalition on Health | National Business Community Blog | National Business Conduct Committee | National Business & Disability Council |
| National Business Education Association | National Business Incubation Association | National Business Opportunity Bureau | National Business Travel Association | National Business Travel Network |
| National Businesswomen's Leadership Association | National Bus Military Bureau | National Bus Rapid Transit Institute | National Bus Sales | National Bus Traffic Association |
| National Button Society | National Cable Television Association | National Cable Television Association Show | National Cable Television Institute | National Cadet Advisory Council |
| National Cadet Corp | National Cadet Special Activity | National CAD Standard | National Cage Bird Show | National Calamity Contingent Duty |
| National Call to Action | National Call to Service | National Cambridge Collectors, Inc. | National Campaign Against Youth Violence | National Campaign for Fair Elections |
| National Campaign for Firework Safety | National Campaign for Freedom of Expression | National Campaign for Hearing Health | National Campaign for Jobs and Income Support | National Campaign for Real Nursery Education |
| National Campaign for the Arts Research and Education | National Campaign on Dalit Human Rights | National Campaign on Labour Rights | National Campaign to Prevent Pregnancy | National Campaign to Prevent Teen and Unplanned Pregnancy |
| National Campaign to Prevent Teen Pregnancy | National Campaign to Restore Civil Rights | National Campaign to Stop Red-light Running | National Campaign to Stop Violence | National Camp Association |
| National Camping Association of Japan | National Camps for Blind Children | National Camps for the Blind | National Campus and Community Radio Association | National Campus and Community Radio Conference |
| National Campus Energy Challenge | National Campus Life Network | National Campus Ministry Association | National Campus Safety Awareness Month | National Canadian Association of Skilled Trades |
| National Cancer Advisory Board | National Cancer Awareness Foundation | National Cancer Center | National Cancer Center Hospital | National Cancer Center Institute |
| National Cancer Center of Malawi | National Cancer Center Research Institute | National Cancer Centre of Singapore | National Cancer Data Base | National Cancer Information Center |
| National Cancer Institute | National Cancer Institute Center for Bioinformatics | National Cancer Institute Common Toxicity Criteria | National Cancer Institute/National Toxicology Program | National Cancer Institute of Canada |
| National Cancer Institute of Canada Clinical Trials Group | National Cancer Institute Prostate, Lung, Colorectal & Ovarian Cancer Screening Trial | National Cancer Institute's In Vitro Anticancer Drug Screen | National Cancer Institute Surveillance, Epidemiology and End Results | National Cancer Institute Thesaurus |
| National Cancer Institute Working Formulation | National Cancer Institute Working Group | National Cancer Intelligence Network | National Cancer Leadership Forum | National Cancer Legislation Advisory Committee |
| National Cancer Policy Board | National Cancer Policy Forum | National Cancer Prevention Fund | National Cancer Registrars Association | National Cancer Registry Programme |
| National Cancer Research Centre | National Cancer Research Network | National Cancer Statistics Clearing House | National Cancer Survivors Day | National Cancer Survivors Day Foundation |
| National Candle Association | NPANX | NPANXX | NPA/NXX Active Code List | NPA/NXX Activity Guide |
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