Objective: The purpose of this study was to predict cognitive emotion regulation strategies based on metacognitive beliefs and attribution styles in the addicted people under abstinence period. Method: The statistical population of this consisted of the individuals who had referred to one of the addiction therapy centers in Ghods city in 2016 (under methadone therapy). One hundred and sixty-three participants were randomly selected and completed three questionnaires, namely Wells's Metacognitions Questionnaire, Garnefski's Cognitive Emotion Regulation Questionnaire, and Seligman et al.'s Attributional Style Scale. Multiple regression analysis was used to analyze the data. Results: The results showed that two components of metacognitive beliefs, i.e. positive beliefs about worry and self-awareness could positively predict adaptive emotion regulation strategies; and three components of attribution styles, namely attribution of failure to internal, consistent, and global factors could negatively predict adaptive emotion regulation strategies. Additionally, adaptive cognitive emotion strategies were predicted positively based on the attribution of success to internal and global factors. In addition, positive beliefs about worry and need for thought control could negatively and positively predict maladaptive cognitive emotion regulation strategies, respectively. Also, the attribution of failure to internal and consistent factors could positively predict maladaptive cognitive emotion regulation strategies; and the attribution of success to consistent factors could positively predict maladaptive cognitive emotion regulation strategies. Conclusion: The components of metacognitive beliefs and attribution styles have a determinative role in the explanation of cognitive emotion regulation strategies in the addicted people under the abstinence period.