Introduction: 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 treating this disorder. In recent years, mindfulness- based treatment approaches have attracted the attention of researchers. This research aims to investigate the effect of mindfulness-based treatment on the symptoms of ADHD and mindfulness score in adolescents suffering from ADHD. Materials and Methods: The present research is a clinical trial research with pretest- posttest design and control group (IRCT code: IRCT2016011826079N1). The study sample included 30 female first and second grade high school studentsin Gonabad suffering from ADHD. The tools used in the research included clinical interview, SNAP-IV Parent Rating Scale, and Mindful Attention Awareness Scale. The experimental group received eight 90- minute sessions of mindfulness-based treatments and the control group was assigned to a waiting list. The data was analyzed through descriptive statistics and univariate analysis of covariance by SPSS version 20 software. Results:According to our findings, the experimental group reported fewer symptoms of ADHD in post test (P<0.001)compared to the control group. Moreover, the mindfulness of the experimental group improved in the posttest (<0.001)compared to the control group. Conclusion: The results of the research show that mindfulness-based treatment improved the symptoms of ADHD and mindfulness in adolescents suffering from ADHD

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