Zeljeznicar

Pre-independence (1921–1992)

Željezničar was formed by a group of railway workers. During the early 20th century, there were several football clubs in Sarajevo. They were rich and usually backed by various organizations, most of them on an ethnic basis: Bosnian Muslims, Bosnian Serbs, Bosnian Croats, Bosnian Jews, unlike Željezničar. Since it was a financially poor club, they used to organize dance nights and all the profits made were later used to buy shoes and balls.

Financial problems were not the only ones. The club's embrace of members of all ethnic backgrounds was seen as a threat by many at the time, so Željezničar was suppressed in various ways. Despite that, the club managed to survive, and even beat wealthier clubs. The first official match, a friendly, was played at Kovačići, a Sarajevo settlement, on 17 September 1921 against SAŠK Napredak which resulted in a 5–1 defeat. The next day another game was played, a 2–1 loss against Sarajevski ŠK.

In 1941, World War II came to Sarajevo, and all football activity was stopped. Many footballers were members of the resistance troops, and some of them were killed. After the war, Željo was reborn, and in 1946, it won the Bosnian Republic championship which was one of the 7 regional leagues formed in order to provide participants to the restored Yugoslav championship starting next season. As winners, Željezničar became one of the Bosnian representatives in the Yugoslav top-flight. Soon after, the Sarajevo citizens formed a new club called FK Sarajevo, the club that has remained a major annoyance to Željezničar's fans (known as The Maniacs) until today. That had an influence on the club, so it needed several years to come back to the first division. For most of the time, Željezničar played in the top level. It was relegated four times (the last time in the 1976–77 season), but every time (except the first time in 1947) it returned quickly.

Planinić affair

In 1964, the Football Association of Yugoslavia found Željezničar guilty for match fixing. Alongside Željezničar, Hajduk Split and Trešnjevka were found guilty and were ejected from the First Yugoslav League. Among others, Željezničar players Ivica Osim and Mišo Smajlović were banned from football for one year, and executives from Željezničar including then club president Nusret Mahić were banned from football for life. After a month it was decided that the clubs will stay in the league but points will be deducted, six from Željezničar and five from Hajduk and Trešnjevka each.

UEFA Cup 1971–72 quarter-finalists

The club first appeared in European competitions during the 1963 Mitropa Cup, however serious competitions had to wait until the early 1970s when the team finished the 1970–71 Yugoslav First League season in 2nd place, a result which allowed the club to play in the 1971–72 UEFA Cup where they made the quarter-finals on their very first appearance losing to Ferencvárosi in a penalty shootout.

1971–72 Yugoslav champions

1971–72 Yugoslav First League table (top 5 only):

Željezničar's greatest domestic success at the time came in the 1971–72 season when the team won the championship title, their only top-tier title in the Yugoslav period, which qualified the club for the European Cup during the 1972–73 season where they were eliminated in the first round by Derby County.

Željezničar also finished in third place in the top-tier league on two occasions in a league traditionally dominated by the big four clubs (Red Star Belgrade, Partizan, Hajduk Split and Dinamo Zagreb).

1980–81 Marshal Tito Cup finalists

In the 1980–81 season, Željezničar reached the Yugoslav cup final (Marshal Tito Cup), but lost 2–3 to another Bosnian side Velež Mostar with both Mehmed Baždarević and Vahid Halilhodžić scoring a brace for their respective teams. The venue for the final was the Red Star Stadium in Belgrade played in front of 40,000 fans. That season, Željezničar finished the 1980–81 Yugoslav First League in a disappointing 14th position which meant the club did not play in Europe even though it made the Yugoslav Cup final.

UEFA Cup 1984–85 semi-finalists

Željezničar's best international result was recorded in the 1984–85 season. The team, led by manager Ivica Osim, reached the semi-finals of the UEFA Cup (renamed to UEFA Europa League since the 2009–10 season) where they were eliminated by Hungarian team Videoton. Željezničar finished the domestic championship in third place in the season before, qualifying them for the competition. Željezničar appeared to have had the result at home, leading 2–0 (3–3 on aggregate) against the Hungarians that would send them into a final against Spanish club Real Madrid on the away goals rule; however, two minutes from full-time Videoton scored a crucial goal, eliminating the home side 4–3 on aggregate. Edin Bahtić finished the competition as second-top scorer with 7 goals, one short of József Szabó.

Prior to this success, the team played the quarter-final stage of the inaugural year of the UEFA Cup competition.