National Alliance on Mental Illness (NAMI) 

NAMI is the largest grassroots mental health organization in the United States. They provide support, education, and advocacy for individuals and families affected by mental illness.

Mental Health America (MHA) 

MHA is a community-based nonprofit organization that focuses on addressing the needs of those living with mental illness and promoting overall mental health. They offer resources, screenings, and educational materials. 
Depression and Bipolar Support Alliance (DBSA) 

DBSA provides support and resources for individuals living with depression or bipolar disorder. They offer peer-led support groups, educational materials, and advocacy initiatives. 

Anxiety and Depression Association of America (ADAA)

ADAA is an international nonprofit organization dedicated to the prevention, treatment, and cure of anxiety, depression, OCD, PTSD, and related disorders. They provide resources, webinars, and a searchable database of mental health professionals. 

The Trevor Project 

The Trevor Project is the leading national organization providing crisis intervention and suicide prevention services to LGBTQ+ youth. They offer a 24/7 helpline, online chat, and educational resources. 
Active Minds

Active Minds is a nonprofit organization that focuses on mental health advocacy and education for college students. They empower students to speak openly about mental health and provide resources for campus communities.

Child Mind Institute

The Child Mind Institute is dedicated to transforming the lives of children and families struggling with mental health and learning disorders. They provide clinical care, conduct research, and offer resources for parents and educators. 

National Institute of Mental Health (NIMH) 

NIMH is the leading federal agency for research on mental disorders. They conduct studies, fund research initiatives, and provide information on various mental health conditions. 

To Write Love on Her Arms (TWLOHA)

TWLOHA is a nonprofit movement dedicated to presenting hope and finding help for people struggling with depression, addiction, self-injury, and suicide. They offer support, treatment resources, and a blog sharing personal stories.

American Foundation for Suicide Prevention (AFSP)

AFSP is a nonprofit organization dedicated to understanding and preventing suicide through research, education, and advocacy. They offer support programs, educational resources, and organize fundraising events. 

These organizations play crucial roles in providing support, advocacy, and resources for individuals and families affected by mental health conditions.