- American Association for Laboratory Accreditation (A2LA)
 - Gaithersburg - Nonprofit professional membership society for laboratory accreditation and training in laboratory practices. - American Association for the Advancement of Science (AAAS)@
- Find the American Association for the Advancement of Science (AAAS) sites for research grants, profession services, and science educational resources along with their weekly journal of research, Science Magazine.
- American Astronautical Society@
- Springfield
- American Congress on Surveying and Mapping
- Bethesda - Professional membership society for the fields of surveying, cartography, geodesy, geographic and land information systems, and other disciplines in the spatial data information industry.
- American Consulting Engineers Council
- ACEC is an organization of engineering firms in private practice.
- American Council for an Energy-Efficient Economy (ACEEE)
- Nonprofit devoted to research, publications, and conferences on energy efficiency in buildings, utilities, applicances, office equipment, industry, and transportation.
- American Design Drafting Association (ADDA)
- Rockville - Dedicated to the professional designer drafter in all disciplines including manufacturing, utilities, construction, engineering, government and education.
- American Geological Institute
- Alexandria - A federation of 29 geoscience societies, provides information and educational services to its member societies, promoting a united voice for the geoscience community.
- American Helicopter Society@
- American Society for Horticultural Science
- Alexandria - ASHS promotes and encourages scientific research and education in horticulture.
- American Society for Quality
- Kensington - Advances individual and organizational performance excellence by providing opportunities for learning, quality improvement, and knowledge exchange.
- American Society of Consulting Arborists
- Rockville - Advances the arboricultural consulting profession by promoting public awareness and enhancing the knowledge, skills, and practice of its members.
- American Society of Plant Biologists
- Rockville - Promotes the development of plant physiology, encourages and publishes research, and promotes the interests and growth of plant science in general.
- American Statistical Association
- Alexandria
- Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC International)
- Rockville - Promotes the humane treatment of animals in science through a voluntary accreditation program.
- Association of American Geographers@
- Association of Biomolecular Resource Facilities (ABRF)
- Bethesda - Professional organization promoting research and development, communication, and education among core facilities and research laboratories for biotechnology.
- Association of Science-Technology Centers
- Association of over 400 science and technology museums worldwide.
- Biomass Energy Research Association (BERA)
- Association of biofuels researchers, companies, and advocates that promotes education and research on renewable biomass energy and waste-to-energy systems.
- Biophysical Society
- Bethesda
- Biotechnology Industry Organization
- Represents biotechnology companies, academic institutions and state biotechnology centres.
- Casualty Actuarial Society
- Arlington - Committed to advancing the body of knowledge of actuarial science applied to property, casualty and similar risk exposures.
- Center for Energy and Economic Development (CEED)
- Alexandria - Mission is to enhance the long-term viability of coal-fueled electricity generation in America.
- Center for Marine Conservation
- Committed to protecting ocean environments and conserving the global abundance and diversity of marine life.
- Consortium for Oceanographic Research and Education
- Association of U.S. Oceanographic research institutions, universities, laboratories and aquaria. Our 40 members represent the nucleus of marine research and education in the U.S.
- Entomological Society of America
- Lanham
- Federal Focus, Inc.
- Nonprofit research and educational foundation working on science policy issues and organizing conferences to advance mentoring services, with an emphasis on youth.
- Institute of Industrial Engineers - National Capital Chapter
- Herndon - Serves members in Northern Virginia, Washington, D.C,. and Southern Maryland.
- Integrity Research Institute
- Offering conferences and publications on energy research, future technologies, and public education.
- International Center For Applied Studies In Information Technology
- Fairfax - University-based business IT centre delivering solutions to domestic and international customers.
- International Society of Logistics
- Hyattsville - Professional society of logistics practitioners representing commercial, government, and defence.
- KISS Institute for Practical Robotics (KIPR)
- Reston - A nonprofit educational corporation to promote education in robotics and to research and develop integrated robotics.
- Marine Technology Society@
- Maryland Native Plant Society
- Silver Spring - Dedicated to protecting, conserving, and restoring Maryland's native plants and habitats.
- National 4-H Council
- Chevy Chase - Nonprofit organization dedicated to building partnerships for community youth development that value and involve youth in solving issues critical to their lives, their families and society.
- National Association of Agricultural Educators
- Alexandria
- National Association of State Energy Officials (NASEO)
- Alexandria - Represents state officials who hold primary responsibility over energy policy within their respective governments.
- National Capital Area Skeptics
- College Park - An independent nonprofit educational and scientific organization that promotes critical thinking and scientific understanding.
- National Hydrogen Association (2)
- National Institute for Certification in Engineering Technologies
- Alexandria - Formed to replace ICET and ETCI.
- National Science & Technology Medals Foundation
- A nonprofit, private/public partnership promoting national awareness and inspiring tomorrow's scientists and engineers.
- National Society of Professional Engineers@
- Passive Solar Industries Council
- PSIC offers professional training, consumer education, and analysis tools.
- Plant Conservation Alliance
- A consortium of federal government member agencies and non-federal cooperators working together to conserve and educate people about native plants.
- Potomac Geophysical Society
- Arlington - DC chapter of SEG and AGU. PGS meets the third Thursday of the month from September to May for dinner and a presentation on timely topics in the earth sciences.
- Renewable Fuels Association
- National trade association for the U.S. domestic ethanol industry. Promotes policies, regulations, and research and development initiatives that lead to the increased production and use of fuel ethanol.
- Society for In Vitro Biology
- Largo - Focus is on biological research, development, and applications of significance to science and society through the study of cells and tissues in vitro.
- Society for International Space Cooperation
- Arlington - Seeks to foster cooperation, education, and exchange among the countries of the world in the areas related to scientific advancement and the international exploration of space.
- Technology Transition Corporation
- Provides management and membership services to energy related commercialization and development organizations.
- Telecommunications Industry Association (TIA)@
- Arlington
- Urban and Regional Information Systems Association (URISA)
- A growing professional/educational organization for individuals concerned with the effective use of information systems by local, regional, and state/province governments.
- Utility Wind Interest Group (UWIG)
- Arlington - Works to accelerate the appropriate integration of wind power for utility applications. Membership is open to utilities and other entities that have an interest in wind generation.
- World Energy Efficiency Association (WEEA)
- A nonprofit organization serving as a clearinghouse for information on energy efficiency programs, technologies and measures.
- World Future Society, The@
- Bethesda
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