The complexity of numerous social, biological, and communication systems, is driving many researchers towards the adoption of data mining approaches. The characterization, management and control of complex networks are challenging tasks, common to many areas of Science. The Workshop on Data Mining in Networks intends to facilitate the exchange of ideas between different research communities which share a common interest in extracting models and information from complex networks. The workshop focus will encompass data mining algorithms and applications for complex networks, such as communication networks, social networks, biological networks, citation networks, etc. The workshop is aimed at researchers in Computer Science and other disciplines like Mathematics, Biology, Neuroscience, etc., who share an interest in the analysis and control of complex networks by means of Data Mining approaches.