This handbook provides a comprehensive examination of Western legal systems and the Europeanization of private law, beginning with an introduction to comparative private law and its fundamental concepts, general functions, and objectives in the context of global integration. It delves into the distinct characteristics of civil and common law systems, tracing their historical roots and sources of law. The book further explores the legal framework of the European Union, detailing its institutions, sources of law, and the harmonization of private law, including the protection of human rights. Subsequent sections cover contract law, tort law, and property law, highlighting key principles, the dynamics of negotiations, liability, and the process of harmonization at both European and international levels. Through a detailed analysis of contract formation, breach, and enforcement, alongside the evolution and principles of tort and property law, the book provides a thorough understanding of the convergence and divergence within Western legal traditions.