Lecture Notes in Computer Science

This book constitutes the refereed proceedings of the 21st International Conference on Web and Internet Economics, WINE 2025, held in New Brunswick, NJ, USA, during December 8-11, 2025.The 39 full papers and 28 abstracts included in this volume were carefully reviewed and selected from 225 submissions. They are organized into the following topical sections: Mechanism Design and Pricing; Matching, Markets, and Equilibria; Fairness and Social Choice; AI, Blockchain, and Game Theory; and Online Algorithms.