- American Academy of Environmental Engineers (AAEE)
The American Academy of Environmental Engineers is dedicated to excellence in the practice of environmental engineering to ensure the public health, safety, and welfare to enable humankind to co-exist in harmony with nature.
- American Association of State Highway and Transportation Officials (AASHTO)
The American Association of State Highway and Transportation Officials advocates transportation-related policies and provides technical services to support states in their efforts to efficiently and safely move people and goods.
- American Institute of Architects (AIA)
The American Institute of Architects advocates for the value of architecture and gives architects the resources they need to do their best work, by driving positive change through the power of design.
- American Institute of Chemical Engineers (AlChE)
AIChE is the world's leading organization for chemical engineering professionals, with members from more than 110 countries, providing resources and expertise.
- American Institute of Professional Geologists (AIPG)
The largest geosciences association devoted to ethical and professional practices in the U.S.
- American Nuclear Society (ANS)
Advancing nuclear science and technology for the benefit of humanity
- American Planning Association (APA)
The American Institute of Certified Planners provides nationwide, independent verification of planners' qualifications.
- American Public Transportation Association (APTA)
The American Public Transportation Association is a nonprofit international association of public and private sector member organizations, offering advocacy for federal funding and policies, research, technical expertise and consulting services, workforce development programs, educational conferences and seminars, and 135 subject-matter working committees.
- American Public Works Association (APWA)
The American Public Works Association (APWA) serves professionals in all aspects of public works as a comprehensive public works resource, APWA provides varied educational and networking opportunities that help public works personnel grow in their professionalism and improve the quality of life in the communities they serve.
- American Society of Civil Engineers (ASCE)
The American Society of Civil Engineers represents more than 150,000 members of the civil engineering profession in 177 countries. Founded in 1852, ASCE is the nation's oldest engineering society.
- American Society of Mechanical Engineers (ASME)
The American Society of Mechanical Engineers promotes the art, science and practice of multidisciplinary engineering and allied sciences around the globe.
- American Water Resources Association (AWRA)
Established in 1964, the American Water Resources Association (AWRA) is the preeminent multidisciplinary association for information exchange, professional development and education about water resources and related issues.
- American Water Works Association (AWWA)
The American Water Works Association is an international, nonprofit, scientific and educational society dedicated to providing total water solutions assuring the effective management of water.
- Association for the Advancement of Cost Engineering International (AACEI)
AACE International is the Association for the Advancement of Cost Engineering.
- Association of American Geographers
The American Association of Geographers (AAG) brings together members of the global geographic community by providing students, educators, practitioners, and partners with the resources to help develop their careers, and form professional relationships.
- Association of State Floodplain Managers
Association of State Floodplain Managers is a scientific and educational nonprofit organization dedicated to reducing flood loss in the nation.
- Construction Management Association of America (CMAA)
The Construction Management Association of America is an industry association dedicated to the practice of professional construction management.
- Ecological Society of America
The Ecological Society of America advances the science and practice of ecology and supports ecologists throughout their careers.
- Engineers Without Borders (EWB)
Engineers Without Borders USA (EWB-USA) partners with communities around the world to meet their basic human needs through engineering.
- Federal Water Quality Association (FWQA)
The Federal Water Quality Association is a member association of the Water Environment Federation (WEF). WEF is a not-for-profit technical and educational organization with members from varied disciplines who work toward the WEF vision of preservation and enhancement of the global water environment.
- Geospatial Information and Technology Association (GITA)
The Geospatial Information & Technology Association is the nonprofit product technology showcase for the GIS industry, providing unbiased, world-class information on geospatial technologies.
- Institute of Electrical and Electronics Engineers (IEEE)
IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
- Institute of Industrial Engineers (IIE)
The Institute of Industrial and Systems Engineers (IISE), the world's largest professional society dedicated solely to the support of the profession, is an international, nonprofit association that provides leadership for the application, education, training, research, and development of industrial and systems engineering.
- International Association of Emergency Managers (IAEM)
The International Association of Emergency Managers (IAEM) is a non-profit educational organization dedicated to promoting the "Principles of Emergency Management" and representing those professionals whose goals are saving lives and protecting property and the environment during emergencies and disasters.
- National Association of Flood & Stormwater Management Agencies (NAFSMA)
NAFSMA advocates for effective public policy, securing essential funding, and promoting innovations that help members better serve their communities.
- National Ground Water Association (NGWA)
NGWA is a community of groundwater professionals working together to advance groundwater knowledge and the success of our members through education and outreach; advocacy; cooperation and information exchange; and enhancement of professional practices.
- National Society of Professional Engineers (NSPE)
NSPE is an inclusive, nontechnical organization dedicated to the interests of licensed professional engineers, regardless of practice area, that protects engineers (and the public) from unqualified practitioners, build public recognition for the profession, and stand against unethical practices and inadequate compensation.
- Project Management Institute
PMI is a not-for-profit professional membership association for the project management profession that offers eight certifications that recognize knowledge and competency.
- Society for Ecological Restoration
SER advances the science, practice, and policy of ecological restoration to sustain biodiversity, improve resilience in a changing climate, and re-establish an ecologically healthy relationship between nature and culture.
- Society of American Military Engineers (SAME)
The mission of the Society of American Military Engineers is to promote and facilitate engineering support for national security by developing and enhancing relationships and competencies among uniformed services, public and private sector engineers, and related professionals.
- Society of Women Engineers (SWE)
The Society of Women Engineers is the world's largest advocate and catalyst for change for women in engineering and technology.
- Structural Engineers Association (SEA)
Provides engineering information about Structural Engineering.
- The Society for Cost-Benefit Analysis
The Society for Benefit-Cost Analysis (SBCA) works to improve the theory and practice of benefit-cost analysis and support evidence-based policy decisions.
- Toastmasters International
Toastmasters International is a nonprofit educational organization that teaches public speaking and leadership skills through a worldwide network of clubs.
- U.S. Green Building Council (USGBC)
USGBC is committed to transforming how buildings are designed, constructed, and operated through LEED.
- Water Environment Federation (WEF)
The Water Environment Federation is a nonprofit association that provides technical education and training for thousands of water quality professionals who clean water and return it safely to the environment.