In 2011, and within only a few months, four international conferences on truth were independently organized in Amsterdam ("Truth be told", 23–25 March 2011), Barcelona ("BW7: Paradoxes of truth and denotation", 14–16 June 2011), Paris ("Truth at work", 20–23 June 2011) and Oxford ("Axiomatic theories of truth", 19–20 September 2011). This succession of events and the original work presented at them are evidence that the philosophy of truth is a lively and very diverse area of study. They saw a great variety of methodologies from philosophers, logicians and linguists, and even within these groups, a variety of problems and approaches to those problems. We think, however, that the interaction between the different research programmes was not as intense as it could have been. By collecting in one volume a wide range of the very latest research on truth, we hope to intensify the dialogue between philosophers and thus make a contribution to even better informed research in the future. Hence the title of this volume, Unifying the philosophy of truth, which announces our project.