Marsha M. Linehan (born May 5, 1943) is an American psychologist and author. She is the creator of dialectical behavior therapy (DBT), a type of psychotherapy that combines behavioral science with Buddhist concepts like acceptance and mindfulness.

Linehan is a Professor of Psychology, Adjunct Professor of Psychiatry and Behavioral Sciences at the University of Washington in Seattle and Director of the Behavioral Research and Therapy Clinics. Her primary research is in borderline personality disorder, the application of behavioral models to suicidal behaviors, and drug abuse.