Maher Institute Inc Iranian Journal of Neurodevelopmental Disorders 3115-848X 5 2026 03 01 The Effectiveness of Mindfulness-Based Cognitive Therapy on Quality of Life and Psychological Well-Being (Case Study: Employees of Industrial Companies) The Effectiveness of Mindfulness-Based Cognitive Therapy on Quality of Life and Psychological Well-Being (Case Study: Employees of Industrial Companies) 1 11 EN علی ال یاسین Journal Article 2025 07 06 <p><strong>Purpose: </strong>The objective of this study was to determine the effectiveness of mindfulness-based cognitive therapy (MBCT) on quality of life and psychological well-being among employees working in industrial companies.</p> <p><strong>Methods and Materials: </strong>This quasi-experimental study employed a pretest–posttest design with a control group. The statistical population consisted of all employees of industrial companies in Tehran in 2025, from which 30 participants were selected through convenience sampling and randomly assigned to experimental (n = 15) and control (n = 15) groups. Data were collected using the World Health Organization Quality of Life Questionnaire (WHOQOL-BREF), the Ryff Psychological Well-Being Scale, and the standardized MBCT protocol. The intervention group received eight one-hour MBCT sessions delivered three times per week, while the control group received no intervention during the study period. Data were analyzed using descriptive statistics and inferential tests, including Box’s M test, Levene’s test, multivariate analysis of covariance (MANCOVA), and univariate ANCOVA.</p> <p><strong>Findings: </strong>Inferential analyses showed that the assumption of homogeneity of variances and variance–covariance matrices was met. MANCOVA results indicated a significant multivariate effect of MBCT on the components of quality of life and psychological well-being (p &lt; .01). Univariate ANCOVA demonstrated significant differences between the experimental and control groups in psychological health, social relationships, environmental quality of life, autonomy, personal growth, positive relations with others, purpose in life, and self-acceptance (p &lt; .05). Effect sizes (η²) indicated meaningful impacts of MBCT across domains, with the largest effects observed in social relationships and autonomy. Bonferroni post-hoc tests confirmed that posttest mean scores for the intervention group were significantly higher than those of the control group.</p> <p><strong>Conclusion: </strong>The findings demonstrate that mindfulness-based cognitive therapy is an effective psychological intervention for improving both quality of life and psychological well-being among employees in industrial work settings.</p> https://maherpub.com/index.php/jndd/article/download/645/600