Prosocial behaviors, and more recently, proenvironmental behaviors, have been proposed as two dimensions of an overarching disposition towards the common good. Both behaviors imply a moral dimension and are influenced by the social contexts in which they unfold. In the present study we test these associations, assessing the effect of moral disengagement and peer social norms on prosocial and proenvironmental behaviors. We analyzed the first data wave of an ongoing longitudinal study including 704 Chilean adolescents (301 male, 378 female and 25 do not answer; from 6th to 10th graders). Structural Equation Models showed that prosocial and proenvironmental behaviors were significantly associated with each other, and both with moral disengagement. Direct and cross effects of peer social norms were found for prosocial and proenvironmental behaviors. Moreover, peer social norms on proenvironmental behavior moderated the association between moral disengagement and individual proenvironmental behavior, but the same moderation effect for prosocial norms was not observed. These results highlight the moral nature of prosocial and proenvironmental behaviors and the relevant role that peers have in promoting these behaviors. Results are further discussed regarding their educational and developmental implications.