Since 1999 the ACM Special Interest Group on Electronic Commerce (SIGecom) has sponsored the leading scientific conference on advances in theory, systems, and applications at the interface of economics and computation, including applications to electronic commerce. The Fourteenth ACM Conference on Electronic Commerce (EC'13) will feature invited speakers, paper presentations, workshops, and tutorials. The conference will be held from Sunday, June 16, 2013 through Thursday, June 20, 2013 at University of Pennsylvania, Philadelphia, PA. Accepted technical papers and invited talks will be presented from June 18 through June 20; tutorials and workshops will be held on June 16 and June 17. Accepted papers will be available in the form in which they are published in the ACM Digital Library one week before the conference.