Background and aims: Attention deficit/hyperactivity disorder is one of the disorders that gains attention of psychologists, psychiatrists and researchers. Among the factors that could be involved in the persistence of this disorder is to improper adjust the motivation and high-risk behaviors. Therefore, the aim of the current study was to compare the motivational
self-regulation and high-risk behaviors in students suffering from attention deficit/hyperactivity disorder and normal students.

Methods: This is a descriptive-analytic study. The statistical population of this research includes all male students in the Third grade of high schools (ADHD and normal students) in Ardabil city in the 2014-2015 academic year. The research subjects consisted of 80 students (n=40 for each group). Students in these schools were selected by multistage cluster sampling. To collect data, motivational self-regulation scale, high-risk behavior questionnaire, conners' scale and diagnostic interview based on DSM-5 were used.

Results: The results of multivariate analysis of variance (MANOVA) showed that the
mean of motivational self-regulation scores (all components) in students with attention deficit/hyperactivity disorder (ADHD) was significantly lower than normal students (P<0.001). Also, the results showed that the mean of high-risk behaviors (all components) scores in students with ADHD was significantly higher than the normal students (P<0.001).

Conclusion: The results of these findings in indicative of the importance of motivational
self-regulation strategies and regulation of these incentives is for academic achievement and reduction of aggressive behavior, inattention, distractibility, and ultimately prevention and reduction of high-risk behavior in students with ADHD.