ABSTRACT
This study's purpose is to determine the effectiveness of cognitive group therapy based on schema-focused approach on self-esteem and emotion regulation in drug-addicted prisoners under methadone maintenance treatment (MMT). The research population comprised addicted male prisoners under the MMT in Chenaran Prison. The experimental group received cognitive group therapy based on schema-focused approach, whereas the control group received no treatment. The instruments used for measurement in this research were the Coopersmith Self-Esteem Inventory and the Cognitive Emotion Regulation Questionnaire. Results revealed that cognitive group therapy based on schema-focused approach increase self-esteem and regulate emotions in addicted prisoners who are under the MMT.