Framed from an integrative approach, the current article examined the associations between ethnic identity exploration (EIE), ethnic identity commitment (EIC), and acculturative stress by investigating the mediating role of ethnic attitudes (i.e., in-group favoritism and out-group derogation) in these relationships. Additionally, the moderating role of age was analyzed. A multiple-group path analysis was performed on data collected from 256 Tunisians in early and 248 in middle adolescence living in Italy, which is an interesting and understudied immigrant group characterized by similarities and differences with the host population. In younger adolescents, EIE and EIC were indirectly and positively related to acculturative stress via the mediating role of in-group favoritism and out-group derogation. In older adolescents, EIE was related to higher levels of EIC, which, in turn, was predictive of acculturative stress. The findings are discussed in light of the theoretical framework, research context and limitations, and implications for practice are presented.