In the media or on the street we might hear that a specific country has a moral duty to defend human rights, that environmentalists have a moral duty to push for global systemic reform, or that the affluent have a moral duty to alleviate poverty. Moral duties are regularly attributed to groups, but do such attributions make conceptual sense or are they mere political rhetoric? And what does that imply for the individual members of these groups? Group Duties offers the first comprehensive answer to these questions. Stephanie Collins outlines a Tripartite Model of group duties - so-called because it divides groups into three fundamental categories: combinations, coalitions, and collectives. With this framework in-hand, Collins argues, we can target our political demands at the right entities, in the right way, and for the right reasons.