This book examines, from a legal perspective, the numerous developments in the rules and institutions of the Olympic Games from antiquity to the modern day. It offers a well-informed and insightful explanation of the Lex Olympica, and analyses the legal and institutional aspects that arise in the Olympic Movement (OM), such as its definition, composition and general organisation, its three principal constituents, its three satellite organisations and its organs. Furthermore, it addresses contemporary legal questions and inherent consequences the OM encounters, such as eligibility criteria, legal protection of the Olympic symbol, protection of the environment, advertising and ambush marketing, athletes' freedom of expression and Olympic boycotts.