The Sixth International Workshop on Domain Driven Data Mining 2013 (DDDM 2013) aims to provide a premier forum for sharing findings, knowledge, insight, experience and lessons in tackling potential challenges in discovering actionable knowledge from complex domain problems, such as financial areas, promote the interaction of and fill the gap between data mining research and business expectations, and drive a paradigm shift from traditional data-centered hidden pattern mining to domain-driven actionable knowledge discovery. This year's workshop, DDDM 2013, will be organized by Data Sciences & Knowledge Discovery Research Lab, University of Technology, Sydney, Australia, in conjunction with the IEEE International Conference on Data Mining (ICDM 2013).