This book explores the challenge that the commons present to the private-public dichotomy in a wide variety of national legal systems representing the West European legal tradition as well as post-socialist and post-colonial experiences. It presents national reports from 13 jurisdictions, ranging from Belgium and the South Africa to the US. Constituting the outcome of the 20th General Congress of the International Academy of Comparative Law, held in Fukuoka, Japan in July 2018, it offers a valuable and unique resource for the study of comparative law.