The American Physical Society (APS) is an oeganization that support physicists in the United States

European Physical Society

The IoP is located in England and supports the European cummunity and has excelent resourses

The mission of the Optical Society of America (OSA) is to promote the generation, application and archiving of knowledge in optics and photonics

The national honor society for physics.

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