The Lega Basket Serie A (LBA) is a professional men's club basketball league that has been organised in Italy since 1920. Serie A is organised by Lega Basket, which is regulated by the Italian Basketball Federation (FIP). It is the highest-tier level of the Italian league system. The LBA plays under FIBA rules and currently consists of 16 teams, with the lowest-placed team relegated to the Serie A2 and replaced by the winner of the play-offs of that tier.

The rules of basketball are the rules and regulations that govern the play, officiating, equipment and procedures of basketball. While many of the basic rules are uniform throughout the world, variations do exist. Most leagues or governing bodies in North America, the most important of which are the National Basketball Association and NCAA, formulate their own rules. In addition, the Technical Commission of the International Basketball Federation (FIBA) determines rules for international play; most leagues outside North America use the complete FIBA ruleset.