FK Železničar Niš (Serbian Cyrillic: ФК Железничар Ниш) was a football club based in Niš, Serbia.

Founded in 1928, the club initially competed in the Niš Football Subassociation League, winning the title in 1939 and 1941.

They subsequently participated in the 1946–47 Yugoslav First League as 14.

Oktobar, immediately suffering relegation.

Later on, the club competed for five seasons in the Yugoslav Second League from 1962 to 1967.