This chapter introduces leagues and outlines some key decisions made by leagues. While most examples provided are from the large leagues of North America and Europe, the concepts discussed are relevant to leagues of any size in any location. In many cases, a professional sport will be governed by a league. This body manages and regulates a competition comprising multiple clubs where there will often be a winning club or a competition comprising athletes where there will often be a winning athlete. The geographical area of influence of a league can range from cities and local regions around amateur leagues and kids’ leagues to the entire world for some professional leagues. English Premier League is a private company where the individual soccer clubs playing in that league in a given year are the “shareholders.”.