American Psychological Association is the primary scientific and professional organization for Psychologists in the United States.
Texas Psychological Association represents the scientific and professional interests of Psychologists in the Lone Star State.
Association for Psychological Science is a more scientifically-oriented professional organization for Psychologists in the United States.
National Institute of Mental Health is a useful resource for information about mental/behavioral health problems and treatment options.
GLMA provides useful information about healthcare needs, providers, and treatment options for the gay/lesbian community.