This study aims to investigate the effectiveness of existential group therapy on social and emotional adjustment in women with dependent personality disorder. A pretest-posttest design with a 2-month follow-up was used in the study. Thirty female participants were selected through purposive sampling by using the Millon Clinical Multi-axial Inventory-III questionnaire; subsequently, the subjects completed the Bell Adjustment Inventory. Statistical analysis supports the effectiveness of existential group therapy on social and emotional adjustment; moreover, the changes in the treatment group remained stable during the follow-up. 72.1% of the emotional adjustment variance and 48.6% of the social adjustment variance are explainable by existential group therapy.