This study investigates client factors influencing group therapy dropout and continuation. Group clients (N = 155) were assigned to open-ended interpersonal therapy groups and classified as either dropouts or continuers as defined by the therapist, pattern of attendance, and method of leaving the group. Predictor and criterion variables from client files were coded by two raters and interpersonal variables were condensed using principal component analysis. A discriminant analysis found six significant variables predicting dropout: alcohol/drug problem, somatic complaints, roommate difficulties, general fighting, fighting with partner, and the interpersonal factor labeled introversion. Additionally, one variable was found to predict continuation in group: previous individual counseling. The discriminant function analysis correctly classified over 76% of cases as dropouts or continuers. Implications for group selection are discussed.