Dialectical behaviour therapy (DBT) is a type of cognitive behavioural therapy. Its main goals are to teach people how to live in the moment, cope healthily with stress, regulate emotions, and improve relationships with others. It was originally developed to treat people with borderline personality disorder but has since been adapted for other conditions where the patient exhibits self-destructive behaviour, such as eating disorders and substance abuse. It is also sometimes used to treat post-traumatic stress disorder.

DBT is derived from a philosophical process called dialectics which is based on the concept that everything is composed of opposites and that change occurs when one opposing force is stronger than the other.  In DBT, the client and therapist work to resolve the seeming contradiction between self-acceptance and change in order to bring about positive changes in the patient.