DescriptionBecause biracial and bicultural populations have multiple identities within one domain, they often experience identity denial, identity questioning, intragroup marginalization, and public regard (hereafter referred to as identity rejection). Though identity denial and marginalization have been linked to poor psychological health, the process through which this occurs is unknown. The present study tested identity autonomy and integration as mediators of the relationship between identity rejection and psychological well-being among biracial (N = 341) and bicultural people (N = 334). Using path analysis, the results indicated significant mediation through autonomy and integration for intragroup marginalization and public regard, but not identity denial and questioning. While there were significant differences in overall levels of identity rejection and other key variables, there was no significant moderation by sample in path analysis, suggesting that the relationships between these variables were similar for both biracial and bicultural populations. This study contributes a novel understanding of the process of identity rejection and shared experiences between multiple dual identifying populations.