The 2018–2019 season was Željezničar's 98th in existence and their 19th season in the Premijer Liga BiH. The team competed in the Premijer Liga BiH, Kup BiH and the UEFA Europa League. The club finished on 4th place in the league, while it got knocked out from the cup in the first round. In the season, Željezničar primarily also qualified to the 2019–20 UEFA Europa League qualifying rounds, but the club didn't get an UEFA licence and eventually, 5th placed FK Radnik Bijeljina got qualified.