People often treat diversity as an objective feature of situations that everyone perceives similarly. The current research shows, however, that disagreement often exists over whether a group is diverse. We argue that diversity judgments diverge because they are social perceptions that reflect, in part, individuals’ motivations and experiences, including concerns about how a group would treat them. Therefore, whether a group includes in-group members should affect how diverse a group appears because the inclusion or apparent exclusion of in-group members signals whether perceivers can expect to be accepted and treated fairly. Supporting our claims, three experiments demonstrate that racial minority group members perceive more diversity when groups included racial in-group members rather than members of other racial minority groups. Moreover, important differences exist between Asian Americans and African Americans, which underscore the need for more research to explore uniqueness rather than commonalities across racial minority groups.