Radnik Bijeljina

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.

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 Bečej. They stayed in the Yugoslav Second League for six seasons, being its best classification in the season 1977–78 when they finished 10th.

Another great achievement of FK Radnik Bijeljina was when the junior team won the Bosnia and Herzegovina Cup in 1987. In the semi-final, they beat FK Velež Mostar in Mostar by 5–2. In the final, Radnik beat FK Polet Bosanski Brod in the penalties to win the trophy.

From 1995 to 1997, the club was called FK Panteri Bijeljina and played under that name in the first two seasons of the First League of the Republika Srpska. In the 1998–99 season, Radnik Bijeljina won their first First League of RS title, an achievement reached again in the 2004–05 season.

In the season 2004–05, Radnik won their second Republika Srpska title which got them a place in the Bosnian Premier League for the 2005–06 season. In the 2005–06 season, Radnik finished 13th. A year earlier it had reached the 1/4 finals of the Bosnian Cup.

In the Republika Srpska Cup, after being twice a losing finalist in the 2005–06 and 2008–09 editions, it finally won the Cup in the 2009–10 cup season.

Radnik won its first national trophy in 2016, winning the Bosnian Cup in the 2015–16 season, beating Sloboda Tuzla in the final (agg. 4–1). This way Radnik won a spot in the 2016–17 UEFA Europa League qualifying rounds. Even though they put up a good fight, Radnik got eliminated in the first qualifying round by Bulgarian First League club PFC Beroe Stara Zagora (agg. 2–0).

In the 2018–19 Bosnian Premier League season, Radnik finished on 5th place, but as 4th placed FK Željezničar Sarajevo didn't get an UEFA license to compete in that season's league, Radnik got qualified by default to the 2019–20 UEFA Europa League qualifying rounds. The club got eliminated by FC Spartak Trnava in the first qualifying round, after beating Spartak in the first match in Banja Luka 2–0, but it got eliminetd by Spartak in Trnava in the second match after penalties (2–3 on penalties for Spartak), since the Slovak side defeated Radnik 2–0 in regular time as well.

On 28 March 2020, five years after becoming club chairman of the board, Mladen Krstajić decided to leave Radnik, with Predrag Perković becoming the new club chairman.

In September 2022, fans waved a flag of the Totenkopf Division which is widely viewed as a hate symbol.