This is a broad topic. The resources listed below provide links to sites that contain information about multiple types of disorders. You can also search by particular diagnosis (anxiety, bipolar disorder, depression, etc.)
Note: some of the government sites may be merged in the future by the Trump administration. I am not sure how that will affect the URL or the information provided.
This site is managed by the Society for Neuroscience, and covers a wide variety of topics related to the brain and mind, including mental health topics.
This nonprofit news site offers information about a variety of psychiatric disorders, as well as information about how to maintain good physical and mental health. It was started by the parents of a young woman who killed herself; they wanted to empower others with knowledge they did not have at the time.
This advocacy organization provides information about a variety of mental health disorders, as well as a focus on how to maintain mental health.
National Alliance on Mental Illness
This advocacy organization provides information about anxiety, eating disorders, schizophrenia, bipolar disorder, addiction, and other topics.
National Institute of Mental Health
This government site provides information, fact sheets, and brochures available for download. You can also find information about clinical trials of new treatments.
SAMHSA: Substance Abuse and Mental Health Services Administration
This government site focuses on mental health and addiction disorders.
Ann MacDonald 