Adolescent thinking about the wrongness of antisocial behaviours plays a key role in their own engagement in antisocial conducts. Nevertheless, measures assessing adolescent antisocial evaluations are not common in literature. Informed by the social domain theory and using adolescent actual thinking about antisocial behaviours, this study developed and validated a new dimensional scale of antisocial behaviour evaluation (ASBE) with two sub-samples of Italian adolescents (Total N = 678; M[subscript age] = 15.48, SD = 1.61; 291 males). Applying the exploratory factor analysis within the confirmatory factor analysis framework (abbreviated, E/CFA), we found four correlated dimensions of ASBE: The "impersonal" dimension, including violations carried out against social and legal norms, without any direct contact with other people; the "interpersonal" dimension, reflecting violations that imply harming other persons; the "personal-risky" dimension, containing items that refer to violations whose consequences primarily affect one's own safety and health; the "loyalty" dimension, representing violations that concern reciprocity and loyalty among peers and friends. The scale showed a good internal consistency and validity. The results support a promising use of this new measure for assessing adolescent antisocial thinking and investigating its associations with social cognition, moral reasoning and behaviour.