This book constitutes the thoroughly refereed post-proceedings of the 6th International Conference on Practice and Theory of Automated Timetabling, PATAT 2006, held in Brno, Czech Republic, in August/September 2006.The 25 revised full papers presented were carefully selected during a second round of reviewing and improvement from 70 original conference presentations. The papers are organized in topical sections on general issues, employee timetabling, timetabling of meetings, sports timetabling, course timetabling, school timetabling, and examination timetabling.