Here is a list of national affinity societies for students who are under-represented in the STEM fields. Please review the links to find out more information about local chapters in your area.
American Indian Science and Engineering Society (AISES)
Center for Minorities and People with Disabilities in Information Technology (CMD-IT)
Computing Research Association's Committee on the Status of Women in Computing Research (CRA-W)
National Society of Black Engineers (NSBE)
Society for Advancement of Chicanos/Hispanics and Native Americans in Science (SACNAS)
Society of Hispanic Professional Engineers (SHPE)