University of Mohaghegh Ardabili Journal of Research in Psychopathology 2783-3208 3 8 2022 05 01 The effectiveness of mindfulness-based cognitive therapy on psychological well-being and cognitive emotion regulation strategies in patients with depressive disorder 9 18 1561 10.22098/jrp.2022.10374.1069 EN Reza Abdi Associate Professor of Psychology Department of Psychology Azarbaijan Shahid Madani University, Tabriz, Iran. Susan Esmailzadeh M.A. Student of Psychology Department of psychology, Azarbaijan Shahid Madani University, Tabriz, Iran. Journal Article 2022 02 18 The aim of this study was to evaluate the effectiveness of mindfulness-based cognitive therapy training on psychological well-being and cognitive emotion regulation strategies in patients with chronic depressive disorder. By purposive sampling method, 30 patients with a diagnosis of chronic depressive disorder were admitted to the Aramesh Psychiatric Care Center in Tehran and randomly assigned to the experimental group (n = 15) and the control group (n = 15). The instruments included mindfulness-based cognitive therapy protocol (MBCT) by Garnfski et al. (2006) Cognitive Emotion Regulation and Ryff Psychological Well-Being Questionnaires (1989). The results of the analysis of covariance showed that at the level of p < .05 there was a significant difference in the variables of psychological well-being and cognitive emotion regulation between the experimental and control groups. In psychological well-being (F = 174.30, p < .05), and effect size equal to 0.87, in adaptive cognitive emotion regulation (F = 99.20, p < .05) and effect size (0.80), in cognitive emotion regulation incompatibility (F = 93.87, p < .05) and effect size (0.79) and a significant difference at the significance level of p < .05 were observed between the experimental groups and the control group. Therefore, mindfulness training had a significant effect on psychological well-being and cognitive emotion regulation of people with depressive disorder. https://jrp.uma.ac.ir/article_1561_c113517f0f183b84d5b77bd06a86f9d3.pdf