European Consumer Law has adapted and evolved in response to the rapid growth of e-commerce in the last two decades. Compliance with European Consumer Law: The Case of E-Commerce examines the evolving legal framework at the EU and national levels - from mandatory disclosures to unfair contract terms - and analyses the extent to which scientifically grounded evidence or theories underpin these legislative choices. At the heart of the book lies an original, data-driven inquiry assessing compliance among e-commerce traders with consumer protection rules. The empirical analysis investigates whether 300 traders from four jurisdictions (France, Germany, the Netherlands, and the United Kingdom) comply with their legal duties and identifies reasons for non-compliance. It translates the evidence of previously undiscovered non-compliance patterns into targeted and actionable policy recommendations, presenting a significant new interpretation of the regulatory landscape. Compliance with European Consumer Law offers a unique, analytical perspective and contributes to a deeper understanding of e-commerce regulation. Innovative and engaging, this book advocates for a more evidence-driven approach within European Consumer Law aimed at strengthening the effectiveness of the rules and fostering trader compliance.