This study extends research on dual identity and in-group projection by considering category prototypicality and indispensability, and by focusing on ethnic minority members and their attitudes towards the native majority and minority out-groups. Among a sample of 491 participants of the three largest immigrant-origin groups in the Netherlands, it was found that the minority in-group was seen as relatively more prototypical and relatively more indispensable for the national category in comparison with minority out-groups, but not in comparison with the native majority. In support of the in-group projection model, stronger dual identity was associated with higher relative in-group prototypicality and relative in-group indispensability in comparison with the majority and, via both these relative perceptions, to a less positive attitude towards the native Dutch. In addition and in support of the common in-group identity model, dual identity was associated with more positive minority out-group feelings via higher minority out-group prototypicality and indispensability. It is concluded that dual identity can have both positive and negative consequences for intergroup relations depending on perceived (relative) prototypicality and indispensability, and depending on whether the out-group is the majority or other minorities.