The body primarily responsible for governing international volleyball competitions is called the FIVB, or Fédération Internationale de Volleyball. This organization oversees the rules, regulations, and integrity of volleyball at both professional and amateur levels. The FIVB conducts major international competitions such as the World Championships, World Cup, and Olympic Games, and it also initiates development programs to promote volleyball globally. Their role is crucial in maintaining high standards for the sport and managing its growth and popularity.