PhDs in Logic IV is a graduate conference organized by and for PhD-students. This edition is the fourth one of an annual Belgian–Dutch happening; earlier editions took place in Ghent (2009), Tilburg (2010), and Brussels (2011). As all previous PhDs in Logic conferences, this two-day graduate conference follows this threefold plan: 1. Four established tutorial speakers will each give two one-hour tutorial sessions on a relevant topic in logic. 2. Ten to twenty PhD students are given the opportunity to do a presentation on their own work. 3. Networking will be encouraged by providing for generous breaks and by having lunch with the entire group. The invited tutorial speakers for this year's edition are Valentin Goranko (Technical University of Denmark), Alessandra Palmigiano (University of Amsterdam), Heinrich Wansing (Ruhr University Bochum), and Andreas Weiermann (Ghent University). All speakers have provisionally accepted our invitation.