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. 1990s 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. 2000s In the season 2004–05, Radnik won their second Republika Srpska title which got them a place in the Premier League of Bosnia and Herzegovina for the 2005–06 season. In the 2005–06 Premier League of Bosnia and Herzegovina 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. 2010s 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. 2020s 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,