- Colin A. Ross Institute
 - Formed to further the understanding of psychological trauma and its consequences by providing educational services, research, and clinical treatment of trauma based disorders. - International Society for the Study of Dissociation
- Brings together professionals dedicated to the search for answers to improve the quality of life for all patients with dissociative disorders.
- New England Society for the Study of Dissociation
- Providing educational, training, and networking opportunities for the mental health and social science professionals who are its members.
- Sidran Foundation
- Resources for persons with dissociative disorders and treating professionals. extensive catalogue of books and videos on trauma, post-traumatic stress disorder, dissociative identity disorder (MPD), child sexual abuse.
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