American Physiological Society

The Endocrine Society

Biophysical Society

American Association for the Advancement of Science

American Society for Biochemistry and Molecular Biology

Society for Neuroscience

Federation of American Societies for Experimental Biology

National Academy of Sciences

Genetics Society of America - GSA

The Society for Endocrinology

Physiological Society

HotBot Directory: Biology Associations
(has links to a number of other professional societies)