This study examined factorial invariance, structured means, and association with negative mood of adult attachment across 4 ethnic groups. Online survey data (N = 831) were collected from African American, Asian American, Hispanic American, and Caucasian college students. Results indicated that the factor structure of the Experiences in Close Relationship Scale did not vary across the 4 groups. Asian Americans and perhaps also (p = .051) Hispanic Americans reported greater attachment anxiety, whereas African Americans and Asian Americans reported greater attachment avoidance than did their Caucasian peers. Attachment anxiety was significantly associated with negative mood in every group, although Asian Americans reported a stronger association than their African American and Caucasian peers. The magnitude of the association between attachment avoidance and negative mood was invariant across the groups.