Recent public health research has consistently reported that self-identified multiracial adolescents tend to display more problem behaviors and psychological difficulties than monoracial adolescents. Relying on insights from qualitative analyses using small or clinical samples to interpret these empirical patterns, these studies implicitly assume a pejorative stance toward adolescents' multiracial self-identification. Building on the social psychological arguments underlying Park's and Stonequist's seminal discussions of the "marginal man," we derive hypotheses indicating that self-identified multiracial adolescents may show more psychological difficulties, but are also likely to have more active social interaction and participation than monoracial groups. We also incorporate later elaborations of the marginal man theory to develop alternative hypotheses regarding multiracial youth's school and behavioral outcomes. Based on a nationally representative sample of racially self-identified youth, the results suggest that patterns of multiracial-monoracial differences are generally consistent with the hypotheses derived closely from the marginal man theory or its subsequent elaborations. We examine the heterogeneities within these general patterns across different multiracial categories and discuss the implications of these findings.Despite its pejorative and seemingly outdated connotations, the marginal man theory (Park 1928(Park , 1931Stonequist 1935) remains one of the most common theoretical frames for research on the experiences of multiracial individuals (e.g., Bracey et al. 2004;Campbell and Eggerling-Boeck 2006;Kao 1999). The theory argues that individuals of multiracial backgrounds display different psychological and social characteristics from their monoracial counterparts as a result of living across two or more social worlds with different racial traditions and unequal power. In this research, we apply the marginal man hypotheses () to a large sample of racially self-identified youth in order to discern differences in the psychological, social and behavioral outcomes of multiracial and monoracial adolescents. In doing so, we provide a theoretical exploration for potential social psychological mechanisms that may underlie any enduring differences between self-identified multiracial adolescents and their monoracial peers.We thank Brian Powell, Jane McLeod, Holly Heard, Jenifer Bratter, Michael Yacavone and anonymous reviewers for their comments. We appreciate the support