Since individuals students with Attention Deficit / Hyperactivity Disorder are more likely to perform some unhealthy behaviors than normal people, this study Done aimed to Effect Exercises Cognitive Rehabilitation on Reduction of Unhealthy Eating Behaviors and Attitudes in Adolescents with Attention Deficit / Hyperactivity Disorder. The research design was semi-experimental with pre-test and post-test. The study population consisted of students adolescents 14 to 18 years old diagnosed with Attention Deficit / Hyperactivity Disorder by Kermanshah education counseling experts. That 24 people were selected by Available sampling method and were randomly divided into two groups: cognitive rehabilitation therapy and control group. The experimental group received 12 sessions of 60 minutes twice a week cognitive rehabilitation exercises and the control group Received the same interventions as usual. Williamson Eating Scale was used to measure the level of unhealthy eating behaviors and attitudes in two pre-test and post-test stages. Finally, the data were analyzed by SPSS-23 software using covariance analysis. The results showed that the cognitive rehabilitation training in post-test Compared to the control group had a significant effect on reducing unhealthy eating behaviors and attitudes in students with attention deficit/ hyperactivity disorder. (P <0/001). According to the findings, it can be concluded that cognitive rehabilitation training is effective and can be used to reduce adolescentschr('39') unhealthy eating behaviors and attitudes. It is also suggested that professionals working with adolescents with Attention Deficit /Hyperactivity Disorder should use the results presented to help these people.