This volume contains the papers selected for presentation at JELIA 2012. Competition was very high this year. We received 107 submissions from 31 countries (97 regular papers and 10 system descriptions). Only 36 regular papers and 5 system descriptions were selected for inclusion in the proceedings. The program included three invited talks whose abstracts can be found below: – Leila Amgoud and Philippe Besnard “Logical Limits of Dung’s Abstract Argumentation Framework” – Ulrich Furbach “Extensions of Hyper Tableaux” – Wiebe van der Hoek “On Two Results in Contemporary Modal Logic: Local Definability and Succinctness”