Background: Metacognitive therapy targets self-differentiation and relational beliefs by helping couples identify unhelpful thinking patterns that fuel conflict. By addressing these underlying cognitive processes, metacognitive therapy aims to improve both individual well-being and relational dynamics. Objectives: This research aimed to determine the effectiveness of metacognitive therapy in couples with marital conflicts attending the family court in Karaj city. Methods: The present study employed a semi-experimental design with a pretest-posttest and control group. The statistical population of this study comprised all couples applying for divorce who had sought divorce or marital dispute resolution at the family court in Karaj in the year 2023. A sample of 32 individuals (16 individuals per group) was selected through voluntary sampling, considering the study entry criteria, and randomly assigned to the experimental and control groups. Participants completed questionnaires on their relational beliefs and self-differentiation in the pretest and posttest stages. The experimental group underwent 16 sessions of 90-minute metacognitive therapy, while the control group received no intervention. Data analysis was conducted using analysis of covariance. Data analysis was performed using SPSS-27 software. Results: Metacognitive therapy significantly improved relational beliefs compared to the control group (P < 0.001). The experimental group's mean score increased from 85.19 (± 9.89) at pretest to 135.88 (± 11.91) at posttest, while the control group showed minimal change (pretest: 89.31 ± 7.99; posttest: 95.75 ± 16.94). Similar improvements were observed in self-differentiation scores (P < 0.001). The experimental group's mean score increased from 120.81 (± 8.88) at pretest to 173.50 (± 14.45) at posttest, compared to minimal change in the control group (pretest: 126.31 ± 7.40; posttest: 125.75 ± 11.06). Conclusions: The present study yielded significant findings that support the effectiveness of metacognitive therapy in improving relational and marital functioning. These results are promising, suggesting that metacognitive therapy may be a valuable intervention for couples experiencing marital conflict.
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