Sports law is a set of legal rules regulating sports relations, and sports are thought to be sporting, competitions, training, sports facilities management etc. According to the Sports Act, the sport system in the Republic of Croatia consists of physical and legal persons and school sports companies that are established without legal personality. Physical persons are trainers, athletes, managers and persons who are qualified to work in sports and those who participate in the organization and running of a sports competition. Legal persons in the sport system are institutions, companies and associations. The Sports Club Association is established to perform sports activities to participate in sports competitions. The Sports Club - a Sports Joint Stock Company is a sports club that is founded, operates and terminates under the Companies Act, or the provisions of that law which primarily concern a joint stock company, while the Sports Act regulates the special arrangement of the form of a joint stock company in sports. A sports-based joint-stock company according to the Sports Act can be formed in two ways: the establishment of a new society or the transformation of a sports club - a competition association in the Sports Joint Stock Company. Sports Joint Stock Company can be founded and be a member of the domestic and foreign, physical and legal persons, and reorganization may be compulsory or voluntary.