SD Željezničar is the second largest association of sport clubs with the same name in Bosnia and Herzegovina.
It was founded in 1921 by a group of railway workers as RŠD (Radničko športsko društvo, eng.
Workers' sports society) Željezničar, but after the World War II initial acronym was changed to SD.
The club's biggest international result was recorded in 1985 when they have reached the UEFA Cup semi-final.
They have won the championship title in 1978. and reached the final of EHF Cup in 1982 integrating also foreigners and French players such as Herman Müller and Sylvain Annonier, where they have lost to Gummersbach.
These are the clubs, beside men's basketball and women's football, which no longer exist: SD Željezničar has a great number of supporters in Bosnia and Herzegovina.
The most passionate fans are called The Maniacs and they are excellent in creating good atmosphere, outdoors and indoors.
Since football is the most popular sport in country, FK Željezničar have the biggest army of supporters.
Since there is no men's basketball club Željezničar anymore, and people really love that sport, two usually opposite groups of football fans - The Maniacs and Horde Zla (whose SD Sarajevo also does not have a basketball club), can be found together cheering for KK Bosna Royal.