The aim of this study was to investigate the effectiveness of group life skills training on interpersonal problems and loneliness of female high school students in Tabriz. The research was conducted by quasi-experimental method with pretest-posttest design and follow-up with the control group. For this purpose, a school from the two education districts was selected by simple random sampling and the Interpersonal Problems Questionnaire (IIP-32) and Asher, Heimel and Renshaw's Feeling of

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... s were administered to students (pre-test). Among the students whose scores in both questionnaires were a standard deviation higher than the average, the research samples were selected by purposive method. Subjects were randomly divided into experimental and control groups and subjects in the experimental group were trained in life skills training with a ten-pattern pattern for 12 sessions in a group manner for 12 sessions, but the control group did not receive any intervention. In the last training session, both groups answered the questionnaires (post-test). One month later, the subjects in the experimental group completed the questionnaires again (follow-up). Data were analyzed using one-way covariance and paired t-test. The results showed that life skills training was effective in reducing interpersonal problems and feelings of loneliness in the experimental group (P <0.01) and this reduction remained stable in the one-month follow-up phase.