This study was designed to investigate the relationship between mindfulness and externalizing disorders. In this descriptive -correlation study, 250 high school students were selected by cluster sampling. In order to measure the mindfulness characteristics, mindfulness attention awareness scale brown & ryan and to measure externalizing disorders, youth self-report of Achenbach\\\'s self-report form were used was. Data was analyzed by using Pearson correlation and regression analysis. There was a significant inverse relationship between score of mindfulness and total score of externalizing problems -P<0.001-. In addition, there was a significant inverse relationship between mindfulness and components related to externalizing problems -lawlessness, aggression, problems with attention deficit/ hyperactivity, oppositional defiant disorder issues and problems associated with conduct disorder- -P<0.001-. Regression analysis showed that mindfulness with 19% of variance explained can predict symptoms of externalizing disorders. The results showed Mindfulness has significant negative correlation with externalizing disorders symptoms and also mindfulness is able to predict symptoms of externalizing disorders.

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