This article presents a framework for analysis of discourses on ethical cosmopolitanism, and applies it to Martha Nussbaum's Frontiers of Justice (2006), with comparisons to the views of other authors. After outlining the book's form of ethical cosmopolitanism, the article considers the psychological, philosophical and sociological presumptions, the methodology of abstraction, the implicit audiences, and the programmatic targets and implied strategy of social change. It links and comments on sister papers by Giri, McCloskey, Murphy, Nederveen Pieterse and Truong.