In the face of racially-based harassment, the Rejection-Identification Model posits that immigrant-origin youth will seek to protect their self-concept by detaching from the national culture and identifying more with the native culture. Although a large body of work has linked personality to variation in the ways individuals respond to interpersonal stressors, their contributions to native and American identity independently, and in the context of racially-based harassment, have not been carefully examined. The current study thus examined the unique and interactive contributions of racially-based harassment and personality to American and native identity in a sample of 163 immigrant-origin adolescents and emerging adults. In addition to the unique contributions of extraversion and agreeableness to native identity, agreeableness moderated the association between racially-based harassment and American identity. Results shed light on the ways individual-level factors may interact with contextual-level factors to influence group identity development in immigrant-origin youth.