Over the past decade, research in theoretical computer science, artificial intelligence, and microeconomics has joined forces to tackle problems involving incentives and computation. These problems are of particular importance in application areas like the Web and the Internet that involve large and diverse populations. The Conference on Web and Internet Economics (WINE, formerly Workshop on Internet & Network Economics) is an interdisciplinary forum for the exchange of ideas and results on incentives and computation arising from these various fields. Co-located with The 10th Workshop on Algorithms and Models of the Web Graph (WAW 2013), WINE 2013 will be held from December 11, 2013 through December 14, 2013 in Cambridge, MA, USA. The conference will feature invited speakers, tutorials, paper presentations, and a poster session. Invited talks and accepted papers and posters will be presented from December 12, 2013 through December 14, 2013; a tutorial program will take place on December 11, 2013.