We describe the genesis of this special issue on ‘philosophy in/on translation’: a symposium led to the formation of a successful research group. The interface between philosophy and translation studies has become a fruitful research field, as evidenced by the growing number of conferences and publications. Research into translation and philosophy addresses three topics, as identified by Anthony Pym: what philosophers have said about translation; how translation theorists turn to philosophy to support their ideas; and the translation of philosophical texts. We argue for a fourth link: that, following Derrida, the implications of (un)translatability shape the very notion of philosophy. Five future research directions are mapped in detail: th...