Objective:Attention deficit hyperactivity disorder (ADHD) is one of the most common childhood disorders that can often continue through adolescence and adulthood. Different treatment methods have been used so far for curing this disorder during adolescence or adulthood. In recent years mindfulness based treatment approaches have drawn the attention of researchers towards themselves. This research aims to investigate the effect of mindfulness based treatment on decrease of the symptoms of attention deficit hyperactivity disorder, increase of mindfulness, and improvement of emotion dysregulation and internalized problems of adolescent suffering from ADHD. Method: The present research is a quasi-experimental research with pretest-posttest design and control group. The target sample of the research included 30 female high school students of first and second grades in Gonabad who were suffering from attention deficit/ hyperactivity disorder. The tools which were used in the research included clinical interview, SNAP-IV Parent Rating Scale, mindfulness questionnaire, and the Difficulties in Emotion Regulation Scale (DERS). Experimental group received eight 90-minute sessions of mindfulness based treatments and control group was assigned to a waiting list. The data was analyzed by means of descriptive statistics (mean and standard deviation) and univariate analysis of covariance. Results: According to the results of univariate analysis of covariance it was found that experimental group in comparison to control group reported fewer symptoms of ADHD and lower scores in self-reported emotion dysregulation in posttest. Moreover, the mindfulness score of experimental group in comparison to control group increased in the posttest. Conclusion:The results of the research showed that mindfulness based treatment decreased the symptoms of ADHD and emotion dysregulation, and increased mindfulness.

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