Jürgen Habermas’s theory of communicative action has provided the inspiration for a school of Critical International Relations Theory which looks to communication as a source of praxis, and therefore a means of emancipation. This article argues that Critical International Relations Theorists have been too ready to accept Habermas’s claims about the emancipatory power of communication. In particular, it is not clear that a Habermasian Critical International Relations Theory can address the concerns of more sophisticated materialists — not least those of Habermas’s predecessors in the Frankfurt School of Critical Theory. One of the most original of these predecessors, Theodor Adorno, argued that the pursuit of communication between subjects w...