NK Osijek is a prominent Croatian football club from the city of Osijek, the largest in the eastern Slavonia region. They compete in the Croatian Football League (HNL), the top division of Croatian football. The club plays its home matches at the modern Opus Arena, a symbol of its recent growth and ambition. Founded in 1947, Osijek has traditionally been one of the "big four" clubs in Croatia, though often finishing behind the dominant Dinamo Zagreb. The team, known as "Bijelo-plavi" (The White-Blues), has won the Croatian Cup and regularly finishes in European qualification places. In recent years, under new ownership and with significant investment, Osijek has solidified its status as the strongest challenger to Dinamo's supremacy, building a competitive squad with a mix of Croatian internationals and foreign talent. The fan base is passionate and proud, creating a vibrant atmosphere that makes their stadium a difficult place for visitors. In summary, NK Osijek is a club on the rise, representing regional pride and aiming to consistently disrupt the established order in Croatian football.