The relationship between ethnic identity and social behaviors in 60 indigenous juvenile offenders self-identified as Mapuche is analyzed. Ethnic identity is obtained with the IEM Scale: social behaviors, with CACSA; self-reported crimes, with EDA; and judicialized, with FER-R Sheet. The objective was to evaluate the association between the degree of ethnic identity development and the presence of antisocial and prosocial behaviors. The results indicate that the greater the development of ethnic identity, the lesser the presence of antisocial behaviors, with no observed relationship between ethnic identity and prosocial behaviors. The relevance of ethnic identity as a specific protective factor in Mapuche juvenile offenders and in adolescents from other indigenous peoples in general is discussed, becoming a possible focus of intervention to dismiss these behaviors.