• AAAS - American Association for the Advancement of Science
• American Center for Physics
• American Institute of Physics (AIP)
• American Mathematical Society
• American Physical Society (APS)
• Board on Physics and Astronomy
• Canadian Association of Physicists
• FAS - Federation of American Scientists:
• Max-Planck-Society (Fritz-Haber-Institut in Berlin-Dahlem)
• NAS - National Academy of Sciences :
• National Research Council
• National Society of Black Physicists (NSBP)
• Overseas Chinese Physics Association
• Ukrainian Physical Society
  Nongoverment self-managing public organization Kyiv, Ukraine

Teachers and Students Associations

• American Association of Physics Teachers

Acoustics

• Acoustical Society of America (ASA)

Applied Physics and Engineering

• ASEEAmerican Society for Engineering Education
• American Society for Testing and Materials (ASTM)
• ASM International: The Materials Information Society (ASM)
• IEEE - Institute of Electrical and ELectronics Engineers
• IEEE - Computer Society
• IEE -- Institution of Electrical Engineers (UK)
• International Union of Crystallograpy (IUCr)
• (The) Minerals, Metals & Materials Society (TMS)
• National Academy of Engineering
• Society for the Advancement of Material and Process Engineering

Astronomy, Astrophysics and Space

• AAS Homepage
  
• AAVSO Home Page
  
• AIRSEDS
  
• Alachua Astronomy Club
  
• Amherst Astronomical Association
  
• Apollo Society Home Page
  
• Archaeology, Astronautics and SETI* Research Association
  
• Astronomical Association of Queensland
  
• Astronomical Institute of Amsterdam
  
• Astronomical League
  
• Astronomical Society at the University of Illinois
  
• Astronomical Society of Palm Beaches
  
• Astronomical Society of the Desert
  
• Astronomical Society of the Pacific
  
• Astronomy Ireland on the Web
  
• Astroweb
  
• Birmingham Astronomy Society
  
• Calumet Astronomical Society
  
• Cambridge Institute of Astronomy
  
• Canadian Space Society
  
• Central Arkansas Astronomical Society
  
• Chicago Astronomical Society
  
• Cincinnati Astronomical Society
  
• Dark Sky Association
  
• East Valley Astronomy Club
  
• Los Angeles Astronomical Society
  
• Mars Society
  
• National Space Science & Technology Institute
  
• National Space Society
  
• New Jersey Astronomical Society
  
• Penn State Astronomy Department
  
• Royal Astronomical Society of Canada
  
• SEDS
  
• Solent Amateur Astronomers Society
  
• Space Association of Australia
  
• Starfax Astronomy Club
  
• Ventura County Astronomical Society
  
• Von Braun Astronomical Society
  

Bio-Physics, Chemistry and Medicine

• American Association of Physicists in Medicine (AAPM)
• American Chemical Society (ACS)

Geo-Physics, Oceanography, Meteorology

• American Society of Limnology and Oceanography (ASLO)
• International Union of Geodesy and Geophysics (IUGG)
• Oceanography Society (OS)
• National Weather Association
  NWA Web site provides information to members and nonmembers on operational meteorology and related activites. Lists Jobs in meteorology.

Nuclear, Radiation and Health Physics

• American Nuclear Society (ANS)
• Radiological Society of North America (RSNA)

Optics

• Laser Institute of America (LIA)
• Optical Society of America (OSA) [OSA OpticsNet]
• SPIE -- The International Society for Optical Engineering (SPIE)

Other

• SIAM: Society for Industrial and Applied Mathematics