Football is Croatia's most popular sport. The Croatian Football Federation (HNS) is the governing body and is responsible for overseeing all aspects of football in the nation, both professional and amateur. The national and club teams are governed by UEFA in Europe and FIFA in global competitions. The history of the sport is delineated by a variety of unofficial sides as Croatia was not an independent entity until the late 20th century.
The club teams that compete domestically do so in the top flight, the Croatian Football League (Hrvatska nogometna liga), the second-tier, First Football League (Prva NL), the third-tier, Second Football League (Druga NL), and fourth-tier Third Football League (Treća NL). The counties of Croatia likewise compete in a regional league system. Club teams contest their respective league championships, the Croatian Cup, and the Croatian Super Cup. The two largest club teams are Dinamo Zagreb and Hajduk Split, who share a rivalry.