The American Physical Society (APS) is an oeganization that support physicists in the United States
http://www.aps.org ~ [ Read more ]

European Physical Society
http://www.eps.org ~ [ Read more ]

The IoP is located in England and supports the European cummunity and has excelent resourses
http://www.iop.org ~ [ Read more ]

The mission of the Optical Society of America (OSA) is to promote the generation, application and archiving of knowledge in optics and photonics
http://www.osa.org/ ~ [ Read more ]

The national honor society for physics.
http://www.sigmapisigma.org/ ~ [ Read more ]

The Sigma Xi is the new home of one of the oldest and largest scientific organizations in the world. Sigma Xi also publishes the American Scientist, a well known scientific publication
http://www.sigmaxi.org ~ [ Read more ]