Objective: The aim of this study was to examine the psychometric properties of the Children Aggression Scale-Parent Version. CAS-P developed to help evaluate severity, frequency and diversity of aggressive behavior. Methods: The scale has 33 items representing five domains. The CAS-P was completed for 473 clinically referred children's parents. Validity was evaluated by examining the relationship of CAS-P scores to other criteria parent rating scales and for the construct validity confirmatory factor analysis (CFA) was conducted. For the reliability the internal consistency were examined. Results: Consistent with previous research, confirmatory factor analysis of the CASP confirmed the good-fit of the original model (chi(2)=842.15; sd=302; chi(2)/sd)=2.7; RMSEA=0.069; CFI=0.96; NFI=0.95). In order to test the scale for construct validity, the Child Behavior Checklist/4-18 and DSM-IV based Behavior Disorder Screening and rating scale were administered to participants, and the correlations with clinical constructs were in the expected direction. Also the reliability analysis revealed that the CAS-P subscales demonstrated high internal consistency. Conclusion: In the light of the findings, it was concluded that the Turkish version of CAS-P could be used as a reliable and valid tool in research and treatment contexts.