American Association of Physics Teachers
American Astronomical Society: The American Astronomical Society (AAS) is the major organization of professional astronomers in North America. The mission of the AAS is to enhance and share humanity's scientific understanding of the universe.
American Institute of Physics: AIP serves a federation of physical science societies in a common mission to promote physics and allied fields.
American Physical Society: The American Physical Society (APS) is a non-profit membership organization working to advance and diffuse the knowledge of physics through its outstanding research journals, scientific meetings, and education, outreach, advocacy, and international activities.