Fudbalski klub Radnik Bijeljina () is a professional association football club based in the city of Bijeljina that is situated in northeast Bosnia and Herzegovina. The club plays its home matches on the Bijeljina City Stadium, which has a capacity of 6,000 seats. The name Radnik means worker. The club won its first First League of the Republika Srpska title in the 1998–99 season, and the second in the 2004–05 season, after which the club got promoted to the Premier League of Bosnia and Herzegovina. The club was relegated from the Bosnian Premier League in the 2006–07 season. Under the leadership of manager Darko Nestorović, in the 2011–12 season, Radnik once again won the title in the First League of RS and won a second promotion to the Premier League of Bosnia and Herzegovina, where they played until the 2021–22 season. In the 2015–16 season, Radnik had, so far, their biggest success, winning its first national trophy, the Bosnia and Herzegovina Football Cup, after they beat FK Sloboda Tuzla in the two-legged cup final (1–1 in Bijeljina and 0–3 in Tuzla). Winning the cup, the club qualified to the 2016–17 UEFA Europa League qualifying rounds, its first UEFA competition. History The first football was brought to Bijeljina in 1916. The first football club was FK Podrinje which was formed in 1919. Later other clubs were formed such as FK Zora in 1920, FK Građanski in 1923, and FK Semberija in 1935. The clubs from this entire region of Posavlje and Podrinje played in the provincial leagues of the Belgrade Football Subassociation. After the end of World War II, FK Radnik was formed. 1945–1990 FK Radnik Bijeljina was founded on 14 June 1945. It didn't take long for Radnik to win their first trophy. In 1948 they became champions of the Tuzla District beating FK Sloboda Tuzla in the final. A year later, the club reached the 1/16 round of the Yugoslav Cup. In 1957, Radnik entered into the Novi Sad/Srem zone (regional league). In season 1971–72, Radnik became champions of the regional Republic League of Bosnia and Herzegovina and they entered a playoff for a place in the Yugoslav Second League. The club played FK Sloga from Vukovar in the playoff where it won both matches, 4–0 in Bijeljina and 8–0 in Vukovar. It entered the 2nd League of Yugoslavia playing against clubs such as FK Proleter Zrenjanin and FK