Adolescents' responses to negative social experiences can be influenced by parenting behaviors. This includes how parents react to their child's expression of emotions, an aspect of parenting referred to as emotion socialization. Emotion socialization may intersect with cultural values, particularly collectivism, a socially-relevant attitude that emphasizes the importance of interpersonal relationships. Examination of a neural measure called the feedback-related negativity (FRN), thought to reflect the degree to which feedback is experienced as aversive, could help elucidate neural contributions to and consequences of the role of collectivism in such family dynamics. Thus, this study examined whether adolescents' endorsement of collectivism moderated the association of parents' dismissive emotion socialization responses (called override responses) and FRN following peer rejection. A community sample of 83 Latinx (n = 32), Asian American (n = 20), and non-Latinx White (n = 31) adolescents ages 13-17 completed a computerized peer feedback task while continuous electroencephalogram was recorded. Their parents completed a battery of self-report questionnaires. Regression analyses demonstrated that adolescents' endorsement of collectivism moderated the association of override responses and FRN following peer rejection, such that FRN was enhanced as override responses increased for adolescents endorsing low and moderate levels of collectivism. Results suggest that there is cultural variation in the association of the emotion socialization strategy of override and adolescents' neural responses to socially-salient events. Findings have implications for parenting interventions designed to enhance adolescents' emotion regulation abilities.