| National Summer Transportation Institute | National Summit on Africa | National Sunday School Association | National Sunday School Union | National Sunflower Association |
| National Sunflower Association of Canada | National Sun Safety Day | National Sun-Ya-San University | National Supercomputing Center for Energy and the Environment | National Superconducting Cyclotron Laboratory |
| National Superintendent of the Year | National Supers Agency | National Supervisory Authority | National Supervisory Network | National Supplier Clearinghouse |
| National Suppliers Council | National Supply Company | National Supply Service Center | National Supply System | National Support Center |
| national support element | National Support Element | National Support Group | National Support Network | National Support Officer |
| National Support Specialist | National Support Team | National Supreme Anti-Corruption Authority | National Sure Start Month | National Surface Transportation Infrastructure Financing Commission |
| National Surface Transportation Policy and Revenue Study Commission | National Surface Water Survey | National Surf Schools and Instructors Association | National Surgery Centers | National Surgical Adjuvant Breast and Bowel Project |
| National Surgical Adjuvant Study for Breast Cancer | National Surgical Adjuvant Study Group | National Surgical Adjuvant Study of Breast Cancer | National Surgical Assistant Association | National Surgical Hospitals |
| National Surgical Infection Prevention | National Surgical Quality Improvement Program | National Surveillance of Dialysis-Associated Diseases in US. | National Surveillance of Infections in Hospitals | National Surveillance Programme for Communicable Diseases |
| National Surveillance System for Hospital Health Care Workers | National Surveillance System for Pneumoconiosis Mortality | National Surveillance Unit | National Survey of Adolescent Males | National Survey of Adolescents |
| National Survey of Adult Literacy | National Survey of African American Mental Health | National Survey of Early Childhood Health | National Survey of Families and Households | National Survey of Family Growth |
| National Survey of Homeless Assistance Providers and Clients | National Survey of Lead and Allergens in Housing | National Survey of Local Shopping Patterns | National Survey of Personal Health Practices and Consequences | National Survey of Psychiatric Practice |
| National Survey of Recent College Graduates | National Survey of Seismic Protection | National Survey of Sexual Attitudes and Lifestyles | National Survey of Small Business Finances | National Survey of Student Engagement |
| National Survey of Substance Abuse Treatment Services | National Survey of the Use of Booster Seats | National Survey of Veterans | National Survey on Corruption and Governance | National Survey on Drug Abuse |
| National Survey on Drug Abuse and Health | National Survey on Recreation and the Environment | National Survey on Volunteer Activity | National Surveys of Prescription Drug Information Provided to Patients | National Survivors of Suicide Day |
| National Survivor Support Working Group | National Sustainable Agriculture Advisory Council | National Sustainable Agriculture Information Service | National Sustainable Building Advisor Program | National Sustainable Development Partnership |
| National Sustainable Development Strategy | National Sustainment Maintenance Manager | National Swedish Herpetological Association | National Sweet Pea Society | National Swimming Pool Foundation |
| National Swimming Pool Safety Committee | National Swim School Association | National Swine Fever Laboratory | National Swine Improvement Federation | National Swine Research and Information Center |
| National Swine Resource and Research Center | National Swiss Football League | National Symphony Orchestra | National Symphony Orchestra of Ireland | National Symphony Orchestra of Ukraine |
| National Symphony Orchestra of Washington | National Symphony Youth Orchestra | National Symposium for Debate | National Symposium for the Advancement of Women in Science | National Symposium on Arts Education |
| National Symposium on Music Instruction Technology | National Symposium on Sensor and Data Fusion | National Synchrotron Light Source | National Synchrotron Radiation Laboratory | National Synchrotron Radiation Research Center |
| National Synchrotron Research Center | National Syndromic Surveillance Conference | National Syrian Seismological Center | National System for Emergency Coordination | National System for Emergency Preparedness |
| National System for Geospatial Intelligence | National System for Geospatial-Intelligence | National System for Joint Training | National System of Agricultural Research | National System of Biotechnology Innovation |
| National System of Garage Ventilation, Inc. | National System of Innovation | National System of Interstate and Defense Highways | National System of Mass Electronic Payments | National System of Social Communications |
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