Abstract: The study examined the effect of multiple family therapy on eating disorder symptoms and interpersonal functioning in adolescents with anorexia nervosa (AN). Pre-treatment and post-treatment, twenty patients with AN (n = 8) or atypical AN (EDNOS-AN) (n = 12) were assessed using the eating disorder examination and the eating disorder inventory, inventory of interpersonal problems and structural analysis of social behaviour-Intrex questionnaires. The expected reduction in eating disorder symptomatology was observed, with significant improvement in the patients' body mass index, and a reduction in their restriction, eating concern, weight concern, amount of exercise and drive for thinness. Significant improvements were also found in their interoceptive awareness, self-affirmation and a reduction in their self-blame. The expected reduction in interpersonal problems was not found. However, tendencies for the patients to feel less dominating and vindictive in general, as well as tendencies towards more control/emancipation in relation to the parents were found and are discussed.