***** Boylam Psychiatry Institute, Ankara, Turkey Validity and Reliability of the Turkish Version of DSM-5 Level 2 Inattention Scale (Parent Form for 6-17 Years)   Şermin Yalın Sapmaz*, Burcu Serim Demirgören, Masum Öztürk*, Öznur Bilaç***, Handan Özek Erkuran****, Ertuğrul Köroğlu*****, Ömer Aydemir****** * Department of Child and Adolescent Psychiatry, Celal Bayar University Hospital, Manisa, Turkey **Department of Child and Adolescent Psychiatry, Dokuz Eylul University Hospital, Izmir, Turkey *** Department of Child and Adolescent Psychiatry, Manisa Mental Health Hospital, Manisa, Turkey **** Department of Child and Adolescent Psychiatry, Izmir Dr. Behcet Uz Children’s Hospital, Izmir, Turkey ***** Boylam Psychiatry Institute, Ankara, Turkey ****** Department of Psychiatry, Celal Bayar University Hospital, Manisa, Turkey Introduction: This study aimed to assess Turkish validity and reliability of DSM-V Level 2 Inattention Scale- Parent form, that was used to evaluate symptoms of children between 6-17 years old. Results: Cronbach alpha internal consistency coefficient was 0.931 while item-total score correlation coefficient values were between 0.555 and 0.869, as a result of reliability analyses. Test- retest correlation coefficient was r= 0.765. As for construct validity, there was one factor that accounted for 68.2% of the variance and is congruent with the original structure of the scale. As for concurrent validity, the scale had demonstrated very high levels of correlation with Turgay Inattention subscale (r= 0.946; p<0.0001). Materials & Methods: Study groups consisted of 36 primary school aged children diagnosed with Attention Deficit Hyperactivity Disorder (ADHD) that had applied to get treatment in child and adolescent psychiatry outpatient units of participating centers and 53 healthy volunteers. For assessment, Turgay Evaluation and Rating Form based on DSM-IV diagnostic criteria- Inattention Subscale was used along with DSM-V Level 2 Inattention Scale- Parent Form. CONCLUSIONS: Turkish version of DSM-5 Level 2 Inattention Scale- Parent Form could be used as a valid and reliable tool both in clinical practice and relevant research. KEYWORDS: DSM-5, Inattention Scale, validity, reliability