The 3rd International Conference on Web Intelligence, Mining and Semantics (WIMS'13) is organised under the auspices of Autonomous University of Madrid . The site for the previous editions, WIMS'12 and WIMS'11, can be found here. This is the third in a new series of conferences concerned with intelligent approaches to transform the World Wide Web into a global reasoning and semantics-driven computing machine. Then next conference in this series, WIMS'14 will take place in Lyon (France).