The purpose of this study was to evaluate the factor structure and convergent validity of an Italian translation of the Identity Style Inventory (ISI). Confirmatory factor analyses revealed a clear three-factor structure of identity style and a mono-factor structure of commitment, not only in the overall sample, but also in gender and age sub-groups. Convergent validity was demonstrated by theoretically consistent associations between the ISI dimensions and measures of identity processes, self-esteem, and need for cognitive closure. The findings suggest that the Italian version of the ISI is a useful tool for assessing social-cognitive processes relevant to identity formation in Italian adolescents and college students.