The most successful Željezničar manager in terms of trophies won is Amar Osim, who won five Bosnian Premier League titles, four Bosnian Cups and one Bosnian Supercup.
Amar Osim's impressive managerial record is highlighted by his success in winning five Bosnian Premier League titles, four Bosnian Cups, and a single Bosnian Supercup, cementing his status as the most accomplished Željezničar manager.