Biomedical Engineering Society (BMES)

National: http://www.bmes.org/
Columbia BMES: http://orion.bme.columbia.edu/bmes/

Society for Women Engineers (SWE)

National: http://www.swe.org/
Columbia SWE: http://www.seas.columbia.edu/swe/

IEEE Engineering in Medicine and Biology Society (IEEE-EMBS)

National: http://www.embs.org/ 
Columbia EMBS:http://www.bme.columbia.edu/embs/