This volume LNCS 15534 constitutes the refereed proceedings of the 20th International Conference on Web and Internet Economics, WINE 2024, held in Edinburgh, UK, during December 2-5, 2024.The 34 full papers and 32 abstracts included in this volume were carefully reviewed and selected from 248 submissions. These papers cover a wide range of topics such as computational social choice, fair division, resource allocation, pricing, information design, aggregation, blockchains, auctions, matching markets, contracts, games and Nash equilibria, facility location and security.

This volume LNCS 15534 constitutes the refereed proceedings of the 20th International Conference on Web and Internet Economics, WINE 2024, held in Edinburgh, UK, during December 2-5, 2024.The 34 full papers and 32 abstracts included in this volume were carefully reviewed and selected from 248 submissions. These papers cover a wide range of topics such as computational social choice, fair division, resource allocation, pricing, information design, aggregation, blockchains, auctions, matching markets, contracts, games and Nash equilibria, facility location and security.